在带有一定预载的情况下安装百分表，然后测量制动盘最大外径处的横向跳动。
Fit the dial gauge with some preload and measure the lateral runout at the greatest external diameter of the brake disc.
结果表明：制动盘端面跳动最终以虚拟制动盘厚度变化形式引起制动力矩的波动。
The results show that disc side face run-out results in brake torque variation by means of disc thickness variation.
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