Brake judder can be explained as a dynamical amplification of brake torque variation (BTV) when passing through a critical speed of a vehicle. The BTV arises owing to different geometrical defects e.g. disc thickness variation (DTV), disc runout and dynamical effects. DTV is usually the most important source of these fluctuations. Measurements have been made on a passenger car with heavy DTV on one of its front brakes. The eigen frequency of the wheel suspension was found to be 14 Hz, corresponding to a first order critical speed of 95 km/h. These measurements qualitatively verify the brake model with a maximum caliper vibration amplitude close to 100 km/h followed by a slowly decreasing amplitude.
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机译：当通过车辆的临界速度时，制动闸可以作为制动扭矩变化（BTV）的动态放大。由于不同的几何缺陷，BTV源于例如不同的几何缺陷。盘厚度变化（DTV），圆盘跳动和动力学效果。 DTV通常是这些波动的最重要的来源。在其前刹车之一的乘用车上进行了测量。发现车轮悬浮液的特征频率为14Hz，对应于95 km / h的第一阶临界速度。这些测量定性地验证了较大的最大卡钳振动幅度，接近100km / h，然后缓慢降低幅度。
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