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For ensuring safety of heavy duty vehicles running on long downhill sections, a model was built for the
application of engine brake and service brake combination based on test results. A model of brake temperature rise for
heavy duty vehicles running on long downhill sections was also constructed. For different braking modes, gear positions,
speed and downhill slopes, brake temperature rising to 250°C was used as the index. Then simulation of brake
temperature rise and downhill distance was researched. Simulation results illustrate that the combined braking of low gear
and high speed should be adopted for heavy duty vehicles running on long downhill sections.