Friction Material Fade - When pads reach high temperatures they can sometime "outgas" chemicals that redeposit themselves on the surface of the brake pad.
摩擦性材料衰减——当刹车片达到高温时有时会“蒸腾”出一些化合物并再次沉积到刹车片的表面。
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Among the factors which influence traffic safety, the heat fade of drum brake is a important one.