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When a heavy duty truck with 2 rear axles is turning a curve at slow speed, a large side bending force to the chassis frame occurres as vehicle turning radius becomes smaller. In the past, the stress produced by side bending forces was little analyzed. By our research work of FEM, side bending stress of heavy duty truck could be analyzed accurately.

This paper deals with development of disc brake systems for heavy duty trucks introduced in the market after studying the trend of heavy duty truck market. For reduction of vehicle mass, hydraulic systems were adopted for all wheels while at the same time engineering attention was paid to improve brake torque transfer and pad wear. Besides that,improvement of drag torque and shake back encountered while being developed is discussed. Based on market report the current requirement for improvement and also future trend are described.