当制动盘磨损到影响安全操作或制动间隙无法调节时，即为失效。

When brake disc wears enough to affect safety in operation or can 't adjust clearance, this is called failure.

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车辆制动安全受多方面的影响，鼓式制动器制动间隙的调整对车辆制动安全有很大帮助。

Brake system safety is affected by many factors. Take drum type brakes as an example. Brake adjusting is the most important factor for the safety of brakes.

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本文通过对活塞杆行程原理设计制动间隙自动调整机构的结构分析，详细地讨论了制动间隙自调机构的工作原理以及主要零件的设计方法。

This article mainly analyses the structure of the ACAD . Base on the analysis, there comes out the operating principle of the ACAD and the design for the major components.

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