A brake is a component in a brake system which is used to produce braking force that hinders the movement of a vehicle or the tendency of movement. Except for all kinds of retarders, almost all automobile brakes use the friction between the working surface of the fixed element and the rotating element to produce the braking torque.
At present, the friction brake widely used in all kinds of cars can be divided into drum type and disc type according to the different rotating components. The difference between them lies in: the rotating element in the drum brake friction pair is the brake drum, and its cylinder inner surface is the working surface; The rotating element in the friction pair of disc brake is a disk-shaped brake disc with two end faces as the working surface.
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