New Jersey Administrative Code › Title 13 - LAW AND PUBLIC SAFETY › Chapter 20 - ENFORCEMENT SERVICE › Subchapter 31 - SCHOOL BUS ENHANCED SAFETY INSPECTION OUT-OF-SERVICE CRITERIA › Section 13:20-31.2 - Brake system

Current through Register Vol. 56, No. 14, July 15, 2024
(a) The following are the out-of-service criteria pertaining to the brake system:
1. The number of defective brakes is equal to or greater than 20 percent of the brakes on the vehicle, provided, however, that on a three-axle school bus, one defective brake shall constitute an out-of-service violation. Steering axle brakes are to be included in the 20 percent criterion. A defective brake includes any brake that meets one of the following criteria:
i. Absence of effective braking action upon application of the service brakes, such as brake linings' failing to move or to contact the braking surface upon application;
ii. Missing or broken mechanical components, including shoes, linings, pads, springs, anchor pins, spiders, cam rollers, pushrods, and air chamber mounting bolts;
iii. Loose brake components, including air chambers, spiders, and cam shaft support brackets;
iv. Audible air leak at brake chamber;
v. Brake adjustment limits:
(1) One brake at 1/4 inch or more above the adjustment limit;
(2) Two brakes less than 1/4 inch beyond the adjustment limit also equal one defective brake;
(3) Any wedge brake where the combined brake lining movement of both the top and bottom shoe exceeds 1/8 inch;
vi. Brake linings or pads, except on power unit steering axles:
(1) Cracked, loose, or missing brake lining:
(A) Lining cracks or voids of 1/16 inch in width observable on the edge of the lining;
(B) Portions of a lining segment missing such that a fastening device (rivet or bolt) is exposed when viewing the lining from the edge;
(C) Cracks that exceed 1 1/2 inches in length;
(D) Loose fitting segments (approximately 1/16 inch or more movement); or
(E) Complete lining segment missing.
(2) The following chart shall be adhered to in determining brake adjustment limits, and is incorporated herein.
COMMERCIAL VEHICLE SAFETY ALLIANCE
NORTH AMERICAN UNIFORM OUT-OF-SERVICE CRITERIA
BRAKE ADJUSTMENT REFERENCE CHART
Reference: Paragraph 1.a. of Part II of the Out-of-Service Criteria Brake Adjustment: Shall not exceed those specifications contained hereunder relating to "Brake Adjustment Limit." (Dimensions are in inches.)
CLAMP-TYPE BRAKE CHAMBER DATA
Type
Outside Diameter
Brake Adjustment Limit
6
4 1/2
1 1/4
9
5 1/4
1 3/8
12
5 11/16
1 3/8
16
6 3/8
1 3/4
20
6 25/32
1 3/4
24
7 7/32
1 3/4
30
8 3/32
2
36
9
2 1/4
NOTE: A brake found at the adjustment limit is not a violation.
'LONG STROKE' CLAMP-TYPE BRAKE CHAMBER DATA
Type
Outside Diameter
Brake Adjustment Limit
16
6 3/8
2.0
20
6 25/32
2.0
24
7 7/32
2.0
24*
7 7/32
2.5
30
8 3/32
2.5
*For 3-inch maximum stroke type 24 chambers
NOTE: A brake found at the adjustment limit is not a violation.
TIE ROD STYLE PISTON BRAKE CHAMBER DATA
Type
Outside Diameter
Brake Adjustment Limit
30
6 1/2 (165mm)
2.5 (64mm)
NOTE: A brake found at the adjustment limit is not a violation.
BOLT-TYPE BRAKE CHAMBER DATA
Type
Outside Diameter
Brake Adjustment Limit
A
6 15/16
1 3/8
B
9 3/16
1 3/4
C
8 1/16
1 3/4
D
5 1/4
1 1/4
E
6 3/16
1 3/8
F
11
1 1/4
G
9 7/8
2
NOTE: A brake found at the adjustment limit is not a violation.
ROTOCHAMBER DATA
Type
Outside Diameter
Brake Adjustment Limit
9
4 9/32
1 1/2
12
4 13/16
1 1/2
16
5 13/32
2
20
5 15/16
2
24
6 13/32
2
30
7 1/16
2 1/4
36
7 5/8
2 3/4
50
8 7/8
3
NOTE: A brake found at the adjustment limit is not a violation.
DD-3 BRAKE CHAMBER DATA
Type
Outside Diameter
Brake Adjustment Limit
30
8 1/8
2 1/4
NOTE: A brake found at the adjustment limit is not a violation.
WEDGE BRAKE DATA
The combined movement of both brake shoe lining scribe marks shall not exceed 1/8 inch (3.18mm).
(3) Evidence of oil seepage into or out of the brake lining/drum interface area, including wet contamination of the lining edge accompanied by evidence that further contamination will occur, such as oil running from the drum or a bearing seal. Grease on the lining edge, the back of the shoe, or the drum edge and oil stains with no evidence of fresh oil leakage are not conditions for out-of-service.
(4) Air brakes: Lining with a thickness of less than 1/4 inch or to the wear indicator, if the lining is so marked, measured at the shoe center for drum brakes or less than 1/8 inch for disc brakes.
(5) Hydraulic and electric brakes: Lining with a thickness of 1/16 inch or less at the shoe center for disc or drum brakes; or
vii. Missing brake on any axle required to have brakes.