Code of Massachusetts Regulations › 220 CMR - DEPARTMENT OF PUBLIC UTILITIES › Title 220 CMR 155.00 - Operation Of Motor Vehicles For The Carriage Of Passengers For Hire Under A Certificate Of Public Convenience And Necessity, Charter License, Special Service Or School Service Permit › Section 155.04 - Procedures for Inspecting Pursuant to Federal Regulations

Current through Register 1525, July 5, 2024
The Federal Regulations, 49 CFR 390 through 397, including
		  Sub-chapter B, Appendix G, as appearing in 155.04, or as may be revised in the
		  Code of Federal Regulations, as related to the inspection of Commercial Motor
		  Vehicles or any activity related thereto, are hereby adopted as the Regulations
		  of the Department of Public Utilities. Said regulations are applicable to
		  vehicles transporting more than 16 persons including the driver. In the event
		  of any conflict between these regulations and any other regulations or law of
		  the Commonwealth of Massachusetts, the stricter more stringent standard shall
		  apply.
Vehicles will not be in compliance with 220 CMR 155.04 if, when
		  submitted for inspection, the following conditions exist:
(1)
Brake System
.
(a)
Service Brakes
.
1. All brake systems are to be inspected in
		accordance with the manufacturer's recommended procedures. Absence of braking
		action of any axle required to have brakes upon application of the service
		brakes (such as missing brakes or brake shoe(s) failing to move upon
		application of a wedge, S-cam, cam, or disc brake).
2. Missing or broken mechanical components;
		shoes, lining, pads, springs, anchor pins, spiders, cam rollers, push rods, and
		air chamber mounting bolts.
3.
		Loose brake components including air chamber spiders, and cam shaft support
		brackets.
4. Audible air leak at
		brake chamber (example-ruptured diaphragm, loose chamber clamp,
		etc.).
5. Re-adjustment limits. The
		maximum stroke at which brakes should be readjusted is given below. Any brake
		1/4 or more past the re-adjustment limit or any two brakes at the readjustment
		limit on less than 1/4 beyond the re-adjustment limit shall be cause for
		rejection. Stroke shall be measured with the engine off and reservoir pressure
		of 80 to 90 Pounds per Square Inch (PSI) with brakes fully applied.
BOLT TYPE BRAKE CHAMBER DATA
Type
Effective area (sq. in.)
Outside dia. (in.)
Maximum stroke at which brakes should be
				  adjusted
A
12
6 15/16
1 3/8
B
24
9 3/16
1 3/4
C
16
8 1/16
1 3/4
D
6
5 1/4
1 1/4
E
9
6 3/16
1 3/8
F
36
11
2 1/4
G
30
9 7/8
2
ROTOCHAMBER DATA
Type
Effective area (sq. in.)
Outside dia. (in.)
Maximum stroke at which brakes should be
				  adjusted
9
9
4 9/32
1 1/2
12
12
4 13/16
1 1/2
16
16
5 13/32
2
20
20
5 13/16
2
24
24
6 13/32
2
30
30
7 1/16
2 1/4
36
36
7 5/8
2 3/4
50
50
8 7/8
3
CLAMP TYPE BRAKE CHAMBER DATA
Type
Effective area (sq. in.)
Outside dia. (in.)
Maximum stroke at which brakes should be
				  adjusted
9
9
4 1/2
1 1/4
12
12
5 1/4
1 3/8
16
16
5 11/16
1 3/8
20
20
6 3/8
1 3/4
24
24
6 24/32
1 3/4
30
30
7 7/32
1 3/4 see note
36
36
8 3/32
2
50
50
9
2 1/4
Note: (2 inches for long stroke design)
Wedge Brake Data
. Movement of the
		  scribe mark on the lining shall not exceed 1/16 inch.
6. Brake linings or pads.
a. Lining or pad is not firmly attached to
		the shoe;
b. Saturated with oil,
		grease, or brake fluid; or
c.
		Non-steering axles: Lining with a thickness less than IA inch at the shoe
		center for air drum brakes, 1/16 inch or less at the shoe center for hydraulic
		and electric drum brakes, and less than 1A3 inch for air disc brakes.
d. Steering axles: Lining with a thickness
		less than 3/16 inch at the shoe center for drum brakes, less than Vs inch for
		air disc brakes and 1/16 inch or less for hydraulic disc and electric
		brakes.
7. Missing brake
		on any axle required to have brakes.
8. Mismatch across any power unit steering
		axle of:
a. Air chamber sizes.
b. Slack adjuster length.