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Truck and Bus Foundation Brake Committee Vehicles and equipment Trucks

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Standard

Service Brake Structural Integrity Requirements—Truck and Bus
2023-12-07
CURRENT
J1404_202312
This SAE Recommended Practice presents requirements for the structural integrity of the brake system of all new trucks, buses, and combinations of vehicles designed for roadway use and falling into the following classifications: a Truck and Bus—Over 4500 kg (10 000 lb) GVWR b Combination Vehicles—Towing vehicle over 4500 kg (10 000 lb) GVWR The requirements are based on data obtained from SAE J294.
Standard

Brake Dynamometer Squeal Noise Test Procedure for Commercial Vehicles with Air Brakes
2023-06-02
CURRENT
J3165_202210
This SAE Recommended Practice applies to commercial vehicles above 4540 kg of gross vehicle weight rating equipped with air brakes used under normal operating conditions. The procedure incorporates high and low-temperature test matrices, but does not fully account for the effects of the environment on brake squeal. Much research is currently underway in this area. This document defines brake squeal as a peak noise level of at least 80 dB(A) between 500 Hz and 17 kHz for air disc and drum brakes on on-road vehicles.
Standard

Brake Drum Qualification Recommended Practice
2022-12-20
CURRENT
J2686_202212
This SAE Recommended Practice is intended for qualification testing for brake drums used on highway commercial vehicles with air brakes using an inertia-dynamometer procedure. This document consists of two distinct tests: Part A, durability and speed maintenance test, and Part B, heat check drag sequence test. Each test can be considered to be an independent evaluation of the brake drum which tests different properties.
Standard

Service Brake Structural Integrity Test Procedure - Vehicles Over 4500 kg (10000 pounds) GVWR
2021-12-13
CURRENT
J294_202112
This SAE Recommended Practice establishes a method of testing the structural integrity of the brake system of all new trucks, buses, and combination vehicles designed for roadway use and falling in the following classifications: a Truck and bus: Over 4500 kg (10000 pounds) GVWR b Combination vehicle: Towing vehicle over 4500 kg (10000 pounds) GVWR The test consists of two distinct tests: a structural endurance test followed by a structural ultimate strength test. NOTE: These two tests originated from separate procedures, and were combined in this recommended practice. Each test can be considered to be an independent evaluation of the service brake’s structure. Based on time available, cost limitations, and the desired evaluation and historical data available, either of these tests could be considered as a complete evaluation of the brake’s structure.
Standard

Air Brake Performance and Wear Test Code Commercial Vehicle Inertia Dynamometer
2020-08-20
CURRENT
J2115_202008
This SAE Standard provides test procedures for air and air-over-hydraulic disc or drum brakes used for on-highway commercial vehicles over 4536 kg (10000 pounds) GVWR. This recommended practice includes the pass/fail criteria of Federal Motor Vehicle Safety Standard No. TP-121D-01.
Standard

Brake Effectiveness Marking for Brake Blocks - Truck and Bus
2019-06-06
CURRENT
J1801_201906
This SAE Recommended Practice provides the method to assign numerical values of brake effectiveness, using data from single station inertia dynamometer effectiveness tests, and to identify a uniform procedure to mark these values on the edge of brake blocks in excess of 12.7 mm (0.51 in) in thickness.
Standard

Brake Block Effectiveness Rating
2019-06-06
CURRENT
J1802_201906
This SAE Recommended Practice provides the test procedure and methods to calculate the effectiveness of brake blocks, using an inertia dynamometer. To minimize testing variability, and to optimize standardization and correlation, a single, high volume size of brake block is specified (FMSI No. 4515E) and evaluated in a reference S-cam brake assembly of 419 mm x 178 mm (16.5 in x 7.0 in) size, using a specified brake drum.
Standard

Inertia Dynamometer Rotor Crack Test Procedure for Air Disc Brakes
2019-05-17
HISTORICAL
J3080_201905
This Recommended Practice applies to commercial vehicles equipped with air disc brakes and above 4536 kg of Gross Vehicle Weight Rating. Other assessments on the friction material or rotor related to wear, durability, correlation to product life, noise, judder, compliance to specific regulations, etc., are not part of this RP (Recommended Practice).
Standard

Service Brake Structural Integrity Requirements—Truck and Bus
2019-04-24
HISTORICAL
J1404_201904
This SAE Recommended Practice presents requirements for the structural integrity of the brake system of all new trucks, buses, and combinations of vehicles designed for roadway use and falling into the following classifications: a Truck and Bus—Over 4500 kg (10 000 lb) GVWR b Combination Vehicles—Towing vehicle over 4500 kg (10 000 lb) GVWR The requirements are based on data obtained from SAE J294.
Standard

Inertia Dynamometer Rotor Crack Test Procedure for Air Disc Brakes
2018-03-23
HISTORICAL
J3080_201803
This Recommended Practice applies to commercial vehicles equipped with air disc brakes and above 4536 kg of Gross Vehicle Weight Rating. Other assessments on the friction material or rotor related to wear, durability, correlation to product life, noise, judder, compliance to specific regulations, etc., are not part of this RP (Recommended practice).
Standard

Brake Drum Qualification Recommended Practice
2017-10-30
HISTORICAL
J2686_201710
This SAE Recommended Practice is intended for qualification testing for brake drums used on highway commercial vehicles with air brakes using an inertia-dynamometer procedure. This Recommended Practice consists of two distinct tests: Part A - durability and speed maintenance test, and Part B - heat check drag sequence test. Each test can be considered to be an independent evaluation of the brake drum which tests different properties.
Standard

Service Brake Structural Integrity Test Procedure - Vehicles Over 4500 kg (10 000 lb) GVWR
2015-06-12
HISTORICAL
J294_201506
This SAE Recommended Practice establishes a method of testing the structural integrity of the brake system of all new trucks, buses, and combination vehicles designed for roadway use and falling in the following classifications: a Truck and Bus—Over 4500 kg (10 000 lb) GVWR b Combination vehicle—Towing vehicle over 4500 kg (10 000 lb) GVWR The test consists of two distinct tests: a Structural Endurance Test followed by a Structural Ultimate Strength Test. NOTE—These two tests originated from separate procedures, and were combined in this Recommended Practice. Each test can be considered to be an independent evaluation of the service brake’s structure. Based on time available, cost limitations, and the desired evaluation and historical data available, either of these tests could be considered as a complete evaluation of the brake’s structure.
Standard

Service Brake Structural Integrity Requirements—Truck and Bus
2014-11-15
HISTORICAL
J1404_201411
This SAE Recommended Practice presents requirements for the structural integrity of the brake system of all new trucks, buses, and combinations of vehicles designed for roadway use and falling into the following classifications: a Truck and Bus—Over 4500 kg (10 000 lb) GVWR b Combination Vehicles—Towing vehicle over 4500 kg (10 000 lb) GVWR The requirements are based on data obtained from SAE J294.
Standard

Brake Effectiveness Marking for Brake Blocks—Truck and Bus
2014-10-27
HISTORICAL
J1801_201410
This SAE Recommended Practice provides the method to assign numerical values of brake effectiveness, using data from single station inertia dynamometer effectiveness tests, and to identify a uniform procedure to mark these values on the edge of brake blocks in excess of 12.7 mm (0.51 in) in thickness.
Standard

Brake Block Effectiveness Rating
2014-10-27
HISTORICAL
J1802_201410
This SAE Recommended Practice provides the test procedure and methods to calculate the effectiveness of brake blocks, using an inertia dynamometer. To minimize testing variability, and to optimize standardization and correlation, a single, high volume size of brake block is specified (FMSI No. 4515E) and evaluated in a reference S-cam brake assembly of 419 mm x 178 mm (16.5 in x 7.0 in) size, using a specified brake drum.
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