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This paper discusses the application of advanced coastdown test and analysis methods used to differentiate aerodynamic drag, rolling resistance, and mechanical loss characteristics of light trucks and travel-trailer combinations as related to various light truck classes.

To date, no definitive work to quantify and compare the braking rating horsepower relationships between vehicles equipped with brake assemblies containing asbestos, non-asbestos, and semi-metallic friction material has been completed. This paper will report the results of a brake fade evaluation performed on a 34,000-lb. GVW vehicle in accordance with SAE J880 Brake System Rating Test Code Procedures and has quantified braking horsepower, fade temperature resistance, thermal response temperature rise, lining wear, and drum wear.