A、<span style="font-family: 宋体;font-size: 16px">实现离合器踏板的自由行程</span>
B、<span style="font-family: 宋体;font-size: 16px">减轻从动盘磨损</span>
C、<span style="font-family: 宋体;font-size: 16px">防止热膨胀失效</span>
D、<span style="font-family: 宋体;font-size: 16px">保证摩擦片正常磨损后离合器不失效</span>