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The Effects of Foundation Brake Configuration on Class-8 Tractor Wet Stopping Performance and Stability
Technical Paper
2004-01-2702
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper discusses wet stopping performance and stability comparisons of various foundation brake systems on Class-8 truck tractors (having a GVWR greater than 33,000 lbs.). For these studies, four configurations of foundation brakes were fitted to two modern 6×4 conventional truck tractors without modification to the control, application, or ABS systems. The foundation brakes compared include standard S-cam drum brakes on all six positions, two hybrid configurations (high-output S-cam drum and then air disc brakes on the steer axles), and air disc brakes on all six brake positions. The truck tractors were tested in two weight configurations, LLVW and GVWR using an unbraked control semitrailer.
Analytical analyses of wet brake-in-curve testing indicate that the hybrid brake systems (employing higher-torque brakes on the steer axle only) might degrade brake-incurve performance. This disadvantage appeared to exist for both load conditions. Techniques are offered to normalize maximum brake-in-curve speeds evaluated over a long period of time.
Analyses of Variance (ANOVA) indicate significant effects from each brake configuration change on stopping distance on a wet split-μ surface.
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Dunn, A., Hoover, R., and Zagorski, S., "The Effects of Foundation Brake Configuration on Class-8 Tractor Wet Stopping Performance and Stability," SAE Technical Paper 2004-01-2702, 2004, https://doi.org/10.4271/2004-01-2702.Also In
References
- Dunn, Ashley L. “Jackknife Stability of Articulated Tractor Semitrailer Vehicles with High Output Brakes and Jackknife Detection on Low Coefficient Surfaces,” Ph.D. dissertation the Ohio State University 2003
- Dunn, Ashley Heydinger, Gary Rizzoni, Giorgio Guenther, Dennis “In-Depth Analysis of the Influence of High Torque Brake on the Jackknife Stability of Heavy Trucks,” SAE paper 2003-01-3398 , presented at the SAE Truck and Bus Convention November 2003
- Dunn, A.L. “Brake-In-Turn Study Comparing Disc/Drum to Drum/Drum Truck Brake Combinations,” 19 September 2000
- Zagorski, Scott “Compatibility of ABS Disc/Drum Brakes on Class VIII Vehicles with Multiple Trailers and Their Effects on Jackknife Stability,” Master’s Thesis Ohio State University 2003
- Zagorski Scott, Heydinger, Gary Guenther, Dennis “A Study of Jackknife Stability of Class 8 Vehicles With Multiple Trailers With ABS Disc/Drum Brakes,” SAE Paper 2004-01-1741
- “The Effects of Foundation Brakes on Class-8 Tractor Dry Stopping Performance,” SAE paper 2004-01-2701 Dunn, Ashley L. (Al) Hoover, Richard L. Zagorski Scott B.
- “Class 8 Truck Tractor Braking Performance Improvement Study; Report 1; Straight Line Stopping Performance on a High Coefficient of Friction Surface,” (Al) Dunn Ashley L. (Dick) Richard L Hoover, TRC, Inc. June 2004
- U.S. D.O.T. National Highway Traffic Safety Administration Air Brake Systems Ch. V 10-1-03 5.3.6
- U.S. D.O.T. National Highway Traffic Safety Administration Air Brake Systems June 4 1999