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Vehicle Brake Performance Evaluation
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1970 by SAE International in United States
Annotation ability available
Event: Mid-Year Meeting
An effort was made to evaluate accurately truck air brake performance balance at low application pressures by means of comparing drum temperatures. This procedure produced excellent results, and is a fast, practical method for evaluating brake performance of combination vehicles. The drum, hub, and wheel assemblies used in this evaluation were all the same type and weight. The s-cam used was a 16-1/2 X 7 in. and the wedge was 15 X 7 in. Mixed combinations of these types were tested.
It was found that s-cam brakes are more effective when used on drive axles than when used on trailing axles. A tractor protection valve with a built-in pressure increase of 33% to the trailer brakes was installed to compensate for the more effective drive axle brakes and this provided the desired braking balance.
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CitationNelson, J., "Vehicle Brake Performance Evaluation," SAE Technical Paper 700514, 1970, https://doi.org/10.4271/700514.
- Kourick J. W., “Wedge Brakes Versus Cam Brakes-Theoretical Comparison.” Paper presented at SAE Transportation Meeting, Baltimore, October 1964.
- Johnson W. A., “Brake Balance.” Rockwell-Standard Corp., Automotive Division, 1967.
- Super R. K., “Brake Balance for Highway Commercial Vehicles.” Rockwell-Standard Corp., Brake Division.
- Nelson R. E. and Fitch J. W., “Optimum Braking, Stability and Structural Integrity for Longer Truck Combinations.” Paper 680547 presented at SAE West Coast Meeting, San Francisco, August 1968.