A condition where the parking brakes do not hold will most probably be due to a wheel brake component.

不能按住手煞车的情况最大的可能是由于车轮煞车部件的原因。

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Functionally, an automotive brake system can be divided into wheel brake mechanism and parking brake mechanism.

从功能上讲，汽车制动系可分为行车制动机构和停车制动机构。

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Then air plane wheel brake discs as example, the main machining process of this material including turning and drilling is discussed.

并以飞机机轮刹车盘为例，对该材料主要机加工工序（车削加工、钻削加工）进行工艺探讨。

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To make this work, regular controls had to be replaced with drive-by-wire, and the accelerator, steering wheel and brake are gone in favor of an aerospace-type yoke that (as in a Segway), is moved forward to move the vehicle forward, and back for reversing.

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The computer-control system can then apply the brake on the wheel concerned, and even adjust the amount of engine torque sent to that wheel, so that skidding is prevented.

ECONOMIST: MONITOR