N.J. Admin. Code § 13:20-31.2

Current through Register Vol. 56, No. 24, December 18, 2024

Section 13:20-31.2 - Brake system

(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.

2. In addition to being included in the 20 percent criterion, the following criteria pertaining to steering axle brakes place a school bus in an out-of-service condition:

i. An absence of effective braking action on any steering axle of any school bus required to have steering axle brakes;

ii. A mismatch across any power unit steering axle of:

(1) Air chamber sizes; or

(2) Slack adjuster length; or

iii. Brake linings or pads on the steering axle of any power unit:

(1) Cracked, loose, or missing lining.

(A) Lining cracks or voids 1/16 inch in width are observable on the edge of the lining.

(B) Portions of a lining segment are 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 lining segments (approximately 1/16 inch or more movement).

(E) A complete lining segment is missing.

(2) 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.

(3) Lining with a thickness of less than 3/16 inch for a shoe with a continuous strip of lining or one-quarter inch for a shoe with two pads for drum brakes or to the wear indicator if the lining is so marked, or less than 1/8 inch for air disc brakes, and 1/16 inch or less for hydraulic disc, drum, and electric brakes.

3. The following is the out-of-service criterion pertaining to parking brakes:

i. Any non-manufactured holes or cracks in the spring brake housing section of a parking brake.

4. The following are the out-of-service criteria pertaining to brake drums or rotors (discs):

i. Drums with any external crack or cracks that open upon brake application; or

ii. Any portion of the drum or rotor (disc) is missing or in danger of falling away.

5. The following are the out-of-service criteria pertaining to a brake hose:

i. A hose with any damage extending through the outer reinforcement ply;

ii. A hose that bulges or swells when air pressure is applied;

iii. A hose with an audible leak at other than a proper connection;

iv. Two hoses are improperly joined, such as a splice made by sliding the hose ends over a piece of tubing and clamping the hose to the tube; or

v. An air hose is cracked, broken, or crimped in such a manner as to restrict air flow.

6. The following are the out-of-service criteria pertaining to brake tubing:

i. Tubing with an audible leak at other than a proper connection; or

ii. Tubing is cracked, damaged by heat, broken, or crimped.

7. The following is the out-of-service criterion pertaining to the low pressure warning device:

i. The low pressure warning device is missing, inoperative, or does not operate at 55 pounds per square inch and below, or at one-half of the governor cut-out pressure, whichever is less.

8. The following is the out-of-service criterion pertaining to air loss rate:

i. If an air leak is discovered and the reservoir pressure is not maintained when the governor is cut-in, the reservoir pressure is between 80 and 90 pounds per square inch, the engine is at idle, and the service brakes are fully applied.

9. The following are the out-of-service criteria pertaining to the air reservoir security:

i. The reservoir is separated from its original attachment points by metal fatigue, is broken, or is missing a bolt; or

ii. The reservoir is separated from its original attachment points and the strap securing the reservoir is rotted out or the reservoir is improperly secured with bailing wire, coat hanger-type wire, or other like material.

10. The following are the out-of-service criteria pertaining to the air compressor (normally to be inspected when it is readily visible or when conditions indicate compressor problems):

i. Loose compressor mounting bolts;

ii. Cracked, broken, or loose pulley; or

iii. Cracked or broken mounting brackets, braces, or adapters.

11. The following are the out-of-service criteria pertaining to hydraulic brakes (including power assist over hydraulic and engine-driven hydraulic booster):

i. No brake pedal reserve with the engine running;

ii. The master cylinder is less than one-fourth full;

iii. The power assist unit fails to operate;

iv. Seeping or swelling of a brake hose under application of pressure;

v. A hydraulic hose is abraded or chafed through the outer cover-to-fabric layer;

vi. Fluid lines or connections are restricted, crimped, cracked, or broken;

vii. Any visually observed leaking hydraulic fluid in the brake system upon full brake application; or

viii. Hydraulic system: The brake failure/low fluid warning light is on and/or inoperative.

12. The following are the out-of-service criteria pertaining to the vacuum system:

i. Insufficient vacuum reserve exists to permit one full brake application after the engine is shut off; or

ii. A vacuum hose or line is restricted, is abraded or chafed through the outer cover-to-cord ply, is crimped, cracked, or broken, or a vacuum hose collapses when vacuum is applied.

13. The following is the out-of-service criterion pertaining to the warning signal for the air brake system:

i. The audible or visible warning signal is missing, inoperative, or does not operate when the air pressure available in the brake system is 60 pounds per square inch or less.

N.J. Admin. Code § 13:20-31.2

Administrative correction.
See: 35 New Jersey Register 2260(a).
Amended by R.2005 d.24, effective 1/18/2005.
See: 35 New Jersey Register 5483(a), 37 New Jersey Register 321(a).
Added (a)13.