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Truck and Bus Brake System Performance Requirements (SAE J992)
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English
Abstract
The new SAE J992 establishes minimum service brake system performance requirements and specifically pertains to vehicle stopping ability, pedal force requirements, and brake stability of new vehicles. Testing for SAE J992 includes procedures that were taken from applicable sections of the truck and brake system road test code, SAE J786 dated 1962.
This paper compares SAE J992 and J786 in the areas of test instrumentation, preburnish check, burnish, water recovery, and efffectiveness requirements. Although SAE J992 is briefer than previous test procedures, it is a valid determination of minimum stopping ability, a check on the initial fade due to heat, and a measurement of the water recovery characteristic. The minimum performance values specified are quite stringent for all types of trucks and buses.
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Authors
Citation
Tuegel, R., "Truck and Bus Brake System Performance Requirements (SAE J992)," SAE Technical Paper 680175, 1968, https://doi.org/10.4271/680175.Also In
References
- SAE Recommended Practice “Brake System Road Test Code - Truck and Bus - SAE J786,” March 1962
- Klein B. W. “The New Truck and Bus Road Test Code - Application and Interpretation.” Paper presented at SAE Automotive Engineering Congress Detroit January 1962
- Palmer R. B. “Development andΒackground for Truck and Bus Code.” Paper presented at SAE Automotive Engineering Congress Detroit January 1962
- “Uniform Vehicle Code.” Issued by the National Committee on Uniform Traffic Laws and Ordinances, as revised 1962
- “Motor Carrier Safety Regulations.” Issued by the Interstate Commerce Commission, revised and amended Jan. 1 1965
- “Minimum Standards for School Buses.” Issued by National Commission on Safety Education, National Education Association, as revised 1965
- Dillard J. H “Variations in the Skid Resistance of Highway Surfaces.” Paper 970A presented at SAE Automotive Engineering Congress Detroit January 1965