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Judging the Stopping Capability of Commercial Vehicles Using the Results of a Performance-Based Brake Force Measurement
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Abstract
The ability of performance-based brake testers (PBBTsa) to accurately determine the braking capability of commercial vehicles was investigated through a field study of over 2,800 trucks and buses. Under certain conditions, good agreement was found between the observation of brake-related defects by visual inspection and the measurement of weak brake forces by a PBBT. It was determined that the PBBTs' assessment was an independent measure of a vehicle's as-is braking capability, and should not be expected to correlate well with a visual inspection under any condition. It was also determined that predictions of stopping capability should be possible combining the PBBT results of the brake force and axle load measurements with certain assumptions regarding brake application time and road/tire coefficient of friction. This paper presents a summary of the field test data and introduces a method that can be used with any PBBT for judging a vehicle's braking capability - that of predicted stopping distance compared with that of a minimum “safe” vehicle.
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Citation
Shaffer, S. and Christiaen, A., "Judging the Stopping Capability of Commercial Vehicles Using the Results of a Performance-Based Brake Force Measurement," SAE Technical Paper 982830, 1998, https://doi.org/10.4271/982830.Also In
References
- North American Commercial Vehicle Critical Safety Inspection Item Procedure Commercial Vehicle Safety Alliance 1998
- North American Uniform Out of Service Criteria Commercial Vehicle Safety Alliance 1998
- Federal Motor Carrier Safety Regulations (FMCSR) Annual Inspection Criteria: Appendix G to Subchapter B - Minimum Periodic Inspection Standards, of FMCSR Part 393 from Title 49 of the Federal Code of regulations
- Fancher, P. Bareket, Z. Blower, D. Mink, C. Campbell, K. Evaluation of Brake Adjustment Criteria for Heavy Trucks U.S. DOT FHWA Report # FHWA-MC-94-016 1995
- Evaluation of Performance-Based Brake Testing Technologies Interim Report, FHWA-MC-96-004 December 1995
- Development, Evaluation, and Application of Performance-Based Brake Testing Technologies, Final Report FHWA April 1998
- Shaffer, S.J. Kannel, J.W. Understanding the Portable Roller Dynamometer SAE 982829 Warrendale, PA November 1998
- Code of Federal Regulations 49 CFR 393.52 Federal Motor Carrier Safety Regulations 1998