Heavy and Overweight Vehicle Brake Testing: Combination Five-Axle Tractor-Flatbed, Final Report
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2017-05-01
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TRIS Online Accession Number:1642488
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Abstract:The Federal Motor Carrier Safety Administration (FMCSA), in coordination with the Federal Highway Administration (FHWA), sponsored the Heavy and Overweight Vehicle Brake Testing (HOVBT) program in order to provide information about the effect of gross vehicle weight (GVW) on braking performance. This testing was conducted on a five-axle combination vehicle with tractor brakes meeting the Federal Motor Vehicle Safety Standards (FMVSS) 121 reduced stopping distance requirements required by the National Highway Transportation Safety Administration (NHTSA) in the July 27, 2009 final rule. This report provides a summary of the testing activities, the results of various analyses of the data, and recommendations for future research. Following a complete brake rebuild, instrumentation, and brake burnish, stopping tests were performed at varying brake application pressures from low and moderate initial speeds. These tests were conducted for various brake conditions (fully functioning or with select brakes disabled) at various gross combination vehicle weights ranging from moderately loaded to significantly overloaded conditions. In addition to the stopping tests, performance-based brake tests (PBBTs) were conducted for the various loading and brake conditions. Analysis of the stopping test data showed the stopping distance to increase with load in most cases (as expected) and also showed that more braking force was generated by the drive axle brakes than the trailer axle brakes. The constant-pressure stopping test data revealed a linear relationship between brake application pressure and stopping distance, and an algorithm was developed to normalize stopping data for weight and initial speed.
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