**Bus Braking Performance Test**

**Test Procedure**

DRAFT -- July 1, 2008

BRAKING - STOPPING DISTANCE AND STABILITY TESTS

**ABBREVIATIONS**

ABTC Altoona Bus Test Center

ABS anti lock brake system

A/C air conditioner

ADB Advance design bus

ATA-MC Maintenance Council of the American Trucking Association

CBD central business district

CW curb weight (bus weight including maximum fuel, oil,

and coolant; but without passengers or driver)

dB(A) decibels with reference to 0.0002 microbar as measured on

the \"A\" scale

DIR test director

DR bus driver

EPA Environmental Protection Agency

FFS free floor space (floor area available to standees, excluding

ingress/egress areas, area under seats, area occupied by feet

of seated passengers, and the vestibule area)

FTA Federal Transit Administration

GVL gross vehicle load (150 lb for every designed passenger

seating position, for the driver, and for each 1.5 sq ft of

free floor space)

GVW gross vehicle weight rating (curb weight plus gross vehicle

load)

MECH bus mechanic

mpg miles per gallon

mph miles per hour

NBM new bus models

PSBRTF Penn State Bus Research and Testing Facility

PTI Pennsylvania Transportation Institute

rpm revolutions per minute

SAE Society of Automotive Engineers

SCH test scheduler

SEC Secretary

SLW seated load weight (curb weight plus 150 lb for every

designed passenger seating position and for the driver)

TD test driver

TM track manager

TP test personnel

UMTA Urban Mass Transportation Administration

**I. [TEST OBJECTIVE]{.underline}**

The objective of this test is to provide, for comparison purposes,
braking performance data on transit buses produced by different
manufacturers.

**II. [TEST DESCRIPTION]{.underline}**

The testing will be conducted at the PTI Test Track skid pad area. Brake
tests will be conducted after completion of the GVW portion of the
vehicle durability test. At this point in testing the brakes have been
subjected to a large number of braking snubs and will be considered well
burnished. Testing will be performed when the bus is fully loaded at its
GVW. All tires on each bus must be representative of the tires on the
production model vehicle

The brake testing procedure comprises three phases:

1.  Stopping distance tests

    i.  Dry surface (high-friction, Skid Number within the range of
        70-76)

    ii. Wet surface (low-friction, Skid Number within the range of
        30-36)

2\. Stability tests

3.  Parking brake test

**Stopping Distance** **Tests**

The stopping distance phase will evaluate service brake stops. All
stopping distance tests on dry surface will be performed in a straight
line and at the speeds of 20, 30, 40 and 45 mph. All stopping distance
tests on wet surface will be performed in straight line at speed of 30
mph.

The tests will be conducted as follows:

> **1. Uniform High Friction Tests:** Three maximum deceleration
> straight-line brake applications each at 20, 30, 40 and 45 mph, to a
> full stop on a uniform high-friction surface in a 3.66-m (12-ft) wide
> lane.
>
> **2. Uniform Low Friction Tests:** Three maximum deceleration
> straight-line brake applications from 30 mph on a uniform low friction
> surface in a 3.66-m (12-ft) wide lane.

When performing service brake stops for both cases, the test vehicle is
accelerated on the bus test lane to the speed specified in the test
procedure and this speed is maintained into the skid pad area. Upon
entry of the appropriate lane of the skid pad area, the vehicle\'s
service brake is applied to stop the vehicle as quickly as possible. The
stopping distance is measured and recorded for both cases on the test
data form. Stopping distance results on dry and wet surfaces will be
recorded and the average of the three measured stopping distances will
be considered as the measured stopping distance. Any deviation from the
test lane will be recorded.

**Stability Tests**

This test will be conducted with the vehicle loaded to GVW. The test
consists of four maximum deceleration, straight-line brake applications
on a surface with split coefficients of friction (i.e., the wheels on
one side run on high-friction SN 70-76 or more and the other side on
low-friction \[where the lower coefficient of friction should be less
than half of the high one\] at initial speed of 30 mph).

**(I)** The performance of the vehicle will be evaluated to determine if
it is possible to keep the vehicle within a 3.66m (12 ft) wide lane,
with the dividing line between the two surfaces in the lane's center.
The steering wheel input angle required to keep the vehicle in the lane
during the maneuver will be reported.

# Parking Brake Test

The parking brake phase utilizes the brake slope, which has a 20% grade.
The test vehicle, at its GVW, is driven onto the brake slope and
stopped. With the transmission in neutral, the parking brake is applied
and the service brake is released. The test vehicle is required to
remain stationary for five minutes. The parking brake test is performed
with the vehicle facing uphill and downhill.

**III. [TEST ARTICLE]{.underline}**

The test article is a transit bus equipped with an anti lock brake
system.

**IV. [TEST EQUIPMENT/FACILITIES/PERSONNEL]{.underline}**

**9.1 Test Equipment**

1\. Speed and distance sensor system

2\. Ballast to simulate passenger loading at GVW

3\. Video recorder with playback capability

4\. Non-contacting digital thermometer

**9.2 Test Facility**

> The test site is located at the PTI Test Track using the bus test
> lane's skid pad area. The test site must meet the following
> conditions:
>
> 1\. Ambient temperature between 32^o^F and 90^o^F and pavement
> temperature above 32^o^F.

2\. Wind speed less than 12 mph.

3\. Brake-test lanes are clearly marked, 12 feet wide, and

flat within 1% grade in all directions.

4\. Brake-test lanes are clear of extraneous surface material. The brake
test lanes are checked periodically for compliance with the following
conditions:

i\. One dry surface test lane with skid numbers between 70

and 76 as determined by ASTM E-274 at 40 mph, omitting

water delivery as specified in paragraph 9.1 of that method.

ii\. One wet surface test lane with skid numbers between 30 and 36 as
determined by ASTM E-274 at 25 mph, omitting water delivery as specified
in paragraph 9.1 of that method.

> 5\. The brake slope consists of a clean dry Portland cement concrete
> surface and has a grade of 20%.

**9.3 Test Personnel**

The PTI personnel consist of the following:

1\. Test Driver (TD)

2\. Two Test personnel (TP)

**V. [TEST DATA]{.underline}**

The test data consist of the completed attached data forms (Table 9.6.).
Upon completion of this test, data shall be forwarded to the Test
Manager.

**VI. [TEST PREPARATION AND PROCEDURES]{.underline}**

All stopping distance brake tests will be conducted according to the
following sequence of events.

1\. Check the brakes temperature using a non-contacting laser digital
thermometer. The brakes temperature should be between 150 ^o^F and 200
^o^F.

2\. Accelerate to and maintain a speed exceeding the specified test
speed by 4 to 8 mph.

3\. Close the throttle and coast in gear to approximately 2 mph above
the test speed.

4\. Shift the transmission to neutral and coast until the test speed is
reached, then initiate the stop by means of the service brake control.
The service brake is to be applied at +0 or -1 mph of the specified test
speed.

The details of the stopping distance and stability test procedures are
given in tables 9.1-3. The braking test data should be recorded in Table
9.6. After completing the tests, the post-test procedure given in Table
9.5 will be performed, and any brake system faults or required repairs
will be recorded in Table 9.7. Test results will be recorded in tables
9.9.1 and 2.

**Table 9.1 Braking Test Procedure.**

+-------+--------+-----------------------------------------------------+
| DET   |        |                                                     |
| AILED |        |                                                     |
| TEST  |        |                                                     |
| PROCE |        |                                                     |
| DURES |        |                                                     |
|       |        |                                                     |
| TI    |        |                                                     |
| TLE:9 |        |                                                     |
| Br    |        |                                                     |
| aking |        |                                                     |
| P     |        |                                                     |
| erfor |        |                                                     |
| mance |        |                                                     |
| T     |        |                                                     |
| est - |        |                                                     |
| Sto   |        |                                                     |
| pping |        |                                                     |
| Dis   |        |                                                     |
| tance |        |                                                     |
| and   |        |                                                     |
| Stab  |        |                                                     |
| ility |        |                                                     |
+-------+--------+-----------------------------------------------------+
| Proc  |        | NOMENCLATURE:                                       |
| edure |        |                                                     |
| 9-1   |        | Stopping Distance and Stability                     |
+-------+--------+-----------------------------------------------------+
| OPER  | ACTION | TEST PREPARATION                                    |
|       |        |                                                     |
| STEP  | BY     | AT ABTC                                             |
+-------+--------+-----------------------------------------------------+
| 1     | TP     | Check the tire inflation pressure that is to be as  |
|       |        | specified by the vehicle manufacturer for the       |
|       |        | gross-vehicle-weight rating and is to be            |
|       |        | established cold. Correct the inflation pressure,   |
|       |        | if necessary, and record the correct pressure and   |
|       |        | tires specifications on the test data form.         |
+-------+--------+-----------------------------------------------------+
| 2     | TP     | Install a digital speedometer if one has not been   |
|       |        | previously installed. Mount the speed indicator in  |
|       |        | plain view of the bus driver.                       |
+-------+--------+-----------------------------------------------------+
| 3     | TP     | Inspect the braking system for proper operation and |
|       |        | adjustment to manufacturer specification. Inspect   |
|       |        | the service brake system and the connections of the |
|       |        | ABS for detachment or fracture of any components,   |
|       |        | such as brake springs, brake shoes, houses, control |
|       |        | unit and sensors. Record on the test data form any  |
|       |        | faulty braking components, and make any necessary   |
|       |        | repairs.                                            |
+-------+--------+-----------------------------------------------------+
| 4     | TP     | Load the bus to GVWR minus the weight of TD, TP,    |
|       |        | and test equipment. Check the axle loads and record |
|       |        | them on the test data form.                         |
+-------+--------+-----------------------------------------------------+

**Table 9.1. Braking Test Procedure (Cont'd).**

+-------+--------+-----------------------------------------------------+
| DET   |        |                                                     |
| AILED |        |                                                     |
| TEST  |        |                                                     |
| PROCE |        |                                                     |
| DURES |        |                                                     |
|       |        |                                                     |
| T     |        |                                                     |
| ITLE: |        |                                                     |
| 9.    |        |                                                     |
| Br    |        |                                                     |
| aking |        |                                                     |
| P     |        |                                                     |
| erfor |        |                                                     |
| mance |        |                                                     |
| T     |        |                                                     |
| est - |        |                                                     |
| Sto   |        |                                                     |
| pping |        |                                                     |
| Dis   |        |                                                     |
| tance |        |                                                     |
| and   |        |                                                     |
| Stab  |        |                                                     |
| ility |        |                                                     |
+-------+--------+-----------------------------------------------------+
| Proc  |        | NOMENCLATURE:                                       |
| edure |        |                                                     |
| 9-1   |        | Stopping Distance and Stability                     |
+-------+--------+-----------------------------------------------------+
| OPER  | ACTION | TEST PREPARATION                                    |
|       |        |                                                     |
| STEP  | BY     | AT PSBRTF                                           |
+-------+--------+-----------------------------------------------------+
| 1     | TP     | Record the bus number, date, and persons performing |
|       |        | the test on the data sheet. Retrieve work order     |
|       |        | form for this test.                                 |
+-------+--------+-----------------------------------------------------+
| 2     | TP     | Install the lock-up detector device on each wheel.  |
+-------+--------+-----------------------------------------------------+
| 3     | TP     | Install the speed and distance measuring systems on |
|       |        | the front of the bus. Install the speed/distance    |
|       |        | indicator in the front of the bus, so it is         |
|       |        | accessible to TP.                                   |
+-------+--------+-----------------------------------------------------+
| 4     | TP     | Set vehicle conditions as follows:                  |
|       |        |                                                     |
|       |        | 1\. Fuel to at least 90% of total capacity.         |
|       |        |                                                     |
|       |        | 2\. All accessories off, except the defroster,      |
|       |        | heater, and ventilation when needed.                |
|       |        |                                                     |
|       |        | 3\. All windows and doors closed except those       |
|       |        | necessary for instrumentation purposes.             |
+-------+--------+-----------------------------------------------------+
| 5     | TP/TD  | Drive the bus at 45 mph for 15 min around the bus   |
|       |        | lane at the PTI Test Track. Calibrate or verify the |
|       |        | calibration of the digital speedometer.             |
+-------+--------+-----------------------------------------------------+
| 6     | TP     | Record the environmental data and verify surface    |
|       |        | conditions.                                         |
|       |        |                                                     |
|       |        | 1\. Ambient air temp between 32 ^o^F & 90 ^o^F     |
|       |        |                                                     |
|       |        | 2\. Wind speed less than 12 mph                     |
|       |        |                                                     |
|       |        | 3\. Tail wind less than 5 mph (direction: west to   |
|       |        | east)                                               |
|       |        |                                                     |
|       |        | 4\. Brake test lanes are clear of extraneous        |
|       |        | material                                            |
|       |        |                                                     |
|       |        | 5\. One dry brake test lane (SN 70-76)              |
|       |        |                                                     |
|       |        | 6\. One wet brake test lane (SN 30-36)              |
+-------+--------+-----------------------------------------------------+
| 7     | TP     | Delay the test if any of the above conditions are   |
|       |        | not met; correct the condition if possible.         |
+-------+--------+-----------------------------------------------------+

**Table 9.2. Braking Test Procedure.**

+-------+--------+-----------------------------------------------------+
| DET   |        |                                                     |
| AILED |        |                                                     |
| TEST  |        |                                                     |
| PROCE |        |                                                     |
| DURES |        |                                                     |
|       |        |                                                     |
| T     |        |                                                     |
| ITLE: |        |                                                     |
| 9.    |        |                                                     |
| Br    |        |                                                     |
| aking |        |                                                     |
| P     |        |                                                     |
| erfor |        |                                                     |
| mance |        |                                                     |
| T     |        |                                                     |
| est - |        |                                                     |
| Sto   |        |                                                     |
| pping |        |                                                     |
| Dis   |        |                                                     |
| tance |        |                                                     |
| and   |        |                                                     |
| Stab  |        |                                                     |
| ility |        |                                                     |
+-------+--------+-----------------------------------------------------+
| Proc  |        | NOMENCLATURE:                                       |
| edure |        |                                                     |
| 9-1   |        | Stopping Distance and Stability                     |
+-------+--------+-----------------------------------------------------+
| OPER  | ACTION | TEST PROCEDURE                                      |
|       |        |                                                     |
| STEP  | BY     | STOPPING DISTANCE (FULLY LOADED)                    |
+-------+--------+-----------------------------------------------------+
| 1     | TD     | Drive the bus on the bus test lane at the PTI Test  |
|       |        | Track and make 4 consecutive stops from 20, 30, 40, |
|       |        | and 45 mph. Then check if all the instrumentations  |
|       |        | is working and also check the driver's response     |
|       |        | observations and record his comments at each speed  |
|       |        | (if he observed any unusual behavior during         |
|       |        | braking).                                           |
+-------+--------+-----------------------------------------------------+
| 2     | TP     | Turn on the distance measuring system. Stop the bus |
|       |        | and check all brake temperatures using the          |
|       |        | non-contacting laser thermometer. None of the       |
|       |        | brakes temperature should be higher than 200 ^o^F.  |
+-------+--------+-----------------------------------------------------+
| 3     | TD/TP  | Drive the bus on the bus test lane at the PTI Test  |
|       |        | Track. Accelerate to and maintain a speed 4 to 8    |
|       |        | mph greater than the specified test speed. Maintain |
|       |        | this speed into the brake test run in area. Close   |
|       |        | the throttle at first marker of the run in area.    |
|       |        | Coast to the second marker when the transmission is |
|       |        | to be shifted to neutral. Coast into the            |
|       |        | appropriate brake test lane and apply full, rapid   |
|       |        | brake applications at 20 mph.                       |
+-------+--------+-----------------------------------------------------+
| 4     | TP     | Videotape the braking runs from both sides of the   |
|       |        | bus.                                                |
+-------+--------+-----------------------------------------------------+
| 5     | TP     | Record the stopping distance on the test data form  |
|       |        | (Table 9.9.1.)                                      |
+-------+--------+-----------------------------------------------------+
| 6     | TP     | Repeat steps 3 thru 5 three times for each          |
|       | /TD/TP | condition listed below:                             |
|       |        |                                                     |
|       |        | 1\. Brake from 20, 30, 40 and 45 mph on skid number |
|       |        | 70-76                                               |
|       |        |                                                     |
|       |        | 2\. Brake from 30 mph on skid number 30-36          |
+-------+--------+-----------------------------------------------------+

**Table 9.3. Braking Test Procedure**

+-------+--------+-----------------------------------------------------+
| DET   |        |                                                     |
| AILED |        |                                                     |
| TEST  |        |                                                     |
| PROCE |        |                                                     |
| DURES |        |                                                     |
|       |        |                                                     |
| T     |        |                                                     |
| ITLE: |        |                                                     |
| 9.    |        |                                                     |
| Br    |        |                                                     |
| aking |        |                                                     |
| P     |        |                                                     |
| erfor |        |                                                     |
| mance |        |                                                     |
| T     |        |                                                     |
| est - |        |                                                     |
| Sto   |        |                                                     |
| pping |        |                                                     |
| Dis   |        |                                                     |
| tance |        |                                                     |
| and   |        |                                                     |
| Stab  |        |                                                     |
| ility |        |                                                     |
+-------+--------+-----------------------------------------------------+
| Proc  |        | NOMENCLATURE:                                       |
| edure |        |                                                     |
| 9-1   |        | Stopping Distance and Stability                     |
+-------+--------+-----------------------------------------------------+
| OPER  | ACTION | TEST PROCEDURE                                      |
|       |        |                                                     |
| STEP  | BY     | STABILITY (FULLY LOADED)                            |
+-------+--------+-----------------------------------------------------+
| 1     | TD     | Drive the bus on the bus test lane at the PTI Test  |
|       |        | Track and make 4 consecutive stops from 20, 30, 40, |
|       |        | and 45 mph. Then check if all the instrumentations  |
|       |        | are working and also check the driver's response    |
|       |        | observations and record his comments at each speed  |
|       |        | (if he observed any unusual behavior during         |
|       |        | braking). Skip step if preformed immediately after  |
|       |        | stopping distance test.                             |
+-------+--------+-----------------------------------------------------+
| 2     | TP     | Turn on the distance measuring system. Stop the bus |
|       |        | and check all brake temperatures using the          |
|       |        | non-contacting laser thermometer. None of the       |
|       |        | brakes temperature should be higher than 200 ^o^F.  |
+-------+--------+-----------------------------------------------------+
| 3     | TD/TP  | Drive the bus on a uniform high friction surface    |
|       |        | before entering the split-friction lanes.           |
|       |        | Accelerate to and maintain a speed 4 to 8 mph       |
|       |        | greater than the specified test speed. Maintain     |
|       |        | this speed into the brake test run in area. Close   |
|       |        | the throttle at first marker of the run in area.    |
|       |        | Coast to the second marker when the transmission is |
|       |        | to be shifted to neutral. Coast into the            |
|       |        | appropriate brake test lane, where the right side   |
|       |        | on the low friction lane and the left side on the   |
|       |        | high friction lane and apply full, rapid brake      |
|       |        | applications at 30 mph. Measure the steering- wheel |
|       |        | angle and record the maximum correction required to |
|       |        | maintain the vehicle in straight-line motion.       |
+-------+--------+-----------------------------------------------------+
| 4     | TP     | Videotape the braking runs from both sides of the   |
|       |        | bus.                                                |
+-------+--------+-----------------------------------------------------+
| 5     | TP     | Record the maximum steering wheel angle stopping    |
|       |        | distance on the test data form (Table 9.9.2.)       |
+-------+--------+-----------------------------------------------------+
| 6     | TP/TD  | Repeat steps 4 thru 6 two times for each condition  |
|       |        | listed below:                                       |
|       |        |                                                     |
|       |        | 1\. Braking when vehicle's left side on skid number |
|       |        | 70-76 (High friction)                               |
|       |        |                                                     |
|       |        | 2\. Braking when vehicle's left side on skid number |
|       |        | 30-36 (Low friction)                                |
+-------+--------+-----------------------------------------------------+

**Table 9.4. Braking Test Procedure.**

+-------+--------+-----------------------------------------------------+
| DET   |        |                                                     |
| AILED |        |                                                     |
| TEST  |        |                                                     |
| PROCE |        |                                                     |
| DURES |        |                                                     |
|       |        |                                                     |
| T     |        |                                                     |
| ITLE: |        |                                                     |
| 9.    |        |                                                     |
| Br    |        |                                                     |
| aking |        |                                                     |
| P     |        |                                                     |
| erfor |        |                                                     |
| mance |        |                                                     |
| T     |        |                                                     |
| est - |        |                                                     |
| Sto   |        |                                                     |
| pping |        |                                                     |
| Dis   |        |                                                     |
| tance |        |                                                     |
| and   |        |                                                     |
| Pa    |        |                                                     |
| rking |        |                                                     |
| Brake |        |                                                     |
+-------+--------+-----------------------------------------------------+
| Proc  |        | NOMENCLATURE:                                       |
| edure |        |                                                     |
| 9-1   |        | Stopping Distance and Parking Brake                 |
+-------+--------+-----------------------------------------------------+
| OPER  | ACTION | TEST PROCEDURE                                      |
|       |        |                                                     |
| STEP  | BY     | PARKING BRAKE                                       |
+-------+--------+-----------------------------------------------------+
| 1     | TD     | Drive the bus onto the parking brake ramp facing    |
|       |        | uphill. Stop and hold the bus by means of the       |
|       |        | service brake control.                              |
+-------+--------+-----------------------------------------------------+
| 2     | TP     | Mark the interface between tires and ramp surface   |
|       |        | with chalk.                                         |
+-------+--------+-----------------------------------------------------+
| 3     | TD     | Shift the vehicle's transmission to neutral. Apply  |
|       |        | the parking brake. Release the service brake        |
|       | TP     | control.                                            |
|       |        |                                                     |
|       |        | Start the stopwatch when the service brake control  |
|       |        | is released.                                        |
+-------+--------+-----------------------------------------------------+
| 4     | TP     | Visually observe whether the vehicle remains        |
|       |        | stationary, slides, or rolls.                       |
+-------+--------+-----------------------------------------------------+
| 5     | TP     | After duration of at least 5 min, measure the       |
|       |        | vehicle movement, if any. Record the time of hold   |
|       |        | and vehicle movement on the test data form. Use the |
|       |        | previously made chalk mark to measure vehicle       |
|       |        | movement.                                           |
+-------+--------+-----------------------------------------------------+
| 6     | TD/TP  | If the vehicle did not remain stationary, steps 1   |
|       |        | through 6 may be repeated until it remains          |
|       |        | stationary or a maximum of three times.             |
+-------+--------+-----------------------------------------------------+
| 7     | TD/TP  | Repeat steps 1 through 7 with the vehicle facing    |
|       |        | downhill. Record data in Table 9.9.3.               |
+-------+--------+-----------------------------------------------------+

**Table 9.5. Braking Test Procedure**

+-------+--------+-----------------------------------------------------+
| DET   |        |                                                     |
| AILED |        |                                                     |
| TEST  |        |                                                     |
| PROCE |        |                                                     |
| DURES |        |                                                     |
|       |        |                                                     |
| T     |        |                                                     |
| ITLE: |        |                                                     |
| 9.    |        |                                                     |
| Br    |        |                                                     |
| aking |        |                                                     |
| P     |        |                                                     |
| erfor |        |                                                     |
| mance |        |                                                     |
| T     |        |                                                     |
| est - |        |                                                     |
| Sto   |        |                                                     |
| pping |        |                                                     |
| Dis   |        |                                                     |
| tance |        |                                                     |
| and   |        |                                                     |
| Stab  |        |                                                     |
| ility |        |                                                     |
+-------+--------+-----------------------------------------------------+
| Proc  |        | NOMENCLATURE:                                       |
| edure |        |                                                     |
| 9-1   |        | Stopping Distance and Stability                     |
+-------+--------+-----------------------------------------------------+
| OPER  | ACTION | POST TEST PROCEDURE                                 |
|       |        |                                                     |
| STEP  | BY     | AT ABTC                                             |
+-------+--------+-----------------------------------------------------+
| 1     | TP     | Disconnect and remove the instrumentations.         |
+-------+--------+-----------------------------------------------------+
| 2     | MECH   | Inspect the braking systems for detachment or       |
|       |        | fracture of any components, such as brake springs   |
|       |        | and brake shoes. Record on the test data form any   |
|       |        | faulty braking components and make any necessary    |
|       |        | repairs.                                            |
+-------+--------+-----------------------------------------------------+
| 3     | MECH   | Adjust the brakes to the manufacturer's             |
|       |        | specification.                                      |
+-------+--------+-----------------------------------------------------+
| 4     | MECH   | Inspect all brake system, including control units   |
|       |        | and sensors fittings that were disassembled and     |
|       |        | reassembled. Repair any leaks or disconnections     |
|       |        | that are found.                                     |
+-------+--------+-----------------------------------------------------+
| 5     | MECH/  | Verify that the braking system and ABS are          |
|       |        | operating properly.                                 |
|       | TD/TP  |                                                     |
+-------+--------+-----------------------------------------------------+

**Table 9.6. Braking Test Data Forms**

  ------------------------------------- ---------------------------------
  Bus Number:                           Date:

  Personnel:                            

                                        

  Amb. Temperature (^o^F):              Wind Speed (mph):

  Wind Direction:                       Tail Wind Speed (mph):
  ------------------------------------- ---------------------------------

+--------+-------------+---------------+----------------+-----------+
| TIRE   |             |               |                |           |
| INF    |             |               |                |           |
| LATION |             |               |                |           |
| PR     |             |               |                |           |
| ESSURE |             |               |                |           |
| (psi)  |             |               |                |           |
|        |             |               |                |           |
| Tire   |             |               |                |           |
| Type:  |             |               |                |           |
| Front: |             |               |                |           |
| Rear:  |             |               |                |           |
+--------+-------------+---------------+----------------+-----------+
|        | Left        |               | Right Tire(s)  |           |
|        | Tire(s)     |               |                |           |
+--------+-------------+---------------+----------------+-----------+
| Front  |             |               |                |           |
+--------+-------------+---------------+----------------+-----------+
|        | Inner       | Outer         | Inner          | Outer     |
+--------+-------------+---------------+----------------+-----------+
| Rear   |             |               |                |           |
+--------+-------------+---------------+----------------+-----------+
| Rear   |             |               |                |           |
+--------+-------------+---------------+----------------+-----------+

  ------------- --------------------------- ------------------------------
  AXLE LOADS                                
  (lb)                                      

                Left                        Right

  Front                                     

  Rear                                      
  ------------- --------------------------- ------------------------------

  ------------------------------------ ----------------------------------
  FINAL INSPECTION                     

  Bus Number:                          Date:

  Personnel:                           
  ------------------------------------ ----------------------------------

**Table 9.7. Record of All Braking System Faults/Repairs.**

+-------+-----------+---------------+---------------------------------+
| ##    | ##        | ##            | ## Description                  |
|  Date | Personnel |  Fault/Repair |                                 |
+-------+-----------+---------------+---------------------------------+
|       |           |               |                                 |
+-------+-----------+---------------+---------------------------------+

**Table 9.9.1. Stopping Distance Test Results Form**

+-------------+-------------+-------------+-------------+-------------+
| Stopping    |             |             |             |             |
| Distance    |             |             |             |             |
| (ft)        |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| Speed (mph) | ## Stop 1   | ## Stop 2   | ## Stop 3   | ## Average  |
+-------------+-------------+-------------+-------------+-------------+
| 20 (dry)    |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| 30 (dry)    |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| 40 (dry)    |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| 45 (dry)    |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| 20 (wet)    |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+

**Table 9.9.2. Stability Test Results Form**

+----------+------------+----------------------------------------------+
| S        |            |                                              |
| tability |            |                                              |
| Test     |            |                                              |
| Results  |            |                                              |
| (Split   |            |                                              |
| Friction |            |                                              |
| Road     |            |                                              |
| surface) |            |                                              |
+----------+------------+----------------------------------------------+
| Vehicle  | Attempt    | Maximum Steering Wheel Angle correction      |
|          |            | (deg) & Remarks                              |
| D        |            |                                              |
| irection |            |                                              |
+----------+------------+----------------------------------------------+
| Right    | 1          |                                              |
| Side on  |            |                                              |
| Low SN   |            |                                              |
+----------+------------+----------------------------------------------+
|          | 2          |                                              |
+----------+------------+----------------------------------------------+
| Left     | 1          |                                              |
| Side on  |            |                                              |
| Low SN   |            |                                              |
+----------+------------+----------------------------------------------+
|          | 2          |                                              |
+----------+------------+----------------------------------------------+

### Table 9.9.3. Parking Brake Test Form

+----------+-------+----------+------------+------------+-----+-----+
| PARKING  |       |          |            |            |     |     |
| BRAKE    |       |          |            |            |     |     |
| (Fully   |       |          |            |            |     |     |
| L        |       |          |            |            |     |     |
| oaded) - |       |          |            |            |     |     |
| GRADE    |       |          |            |            |     |     |
| HOLDING  |       |          |            |            |     |     |
+----------+-------+----------+------------+------------+-----+-----+
| Vehicle  | At    | Hold     | Slide      | Roll       | Did | No  |
|          | tempt |          |            |            |     |     |
| D        |       | Time     | (in)       | (in)       | H   | H   |
| irection |       | (min)    |            |            | old | old |
+----------+-------+----------+------------+------------+-----+-----+
| Upgrade  | 1     |          |            |            |     |     |
+----------+-------+----------+------------+------------+-----+-----+
|          | 2     |          |            |            |     |     |
+----------+-------+----------+------------+------------+-----+-----+
|          | 3     |          |            |            |     |     |
+----------+-------+----------+------------+------------+-----+-----+
| D        | 1     |          |            |            |     |     |
| owngrade |       |          |            |            |     |     |
+----------+-------+----------+------------+------------+-----+-----+
|          | 2     |          |            |            |     |     |
+----------+-------+----------+------------+------------+-----+-----+
|          | 3     |          |            |            |     |     |
+----------+-------+----------+------------+------------+-----+-----+