The first brakes - still popular in low costapplications - were drum brakes. The name comes from the actual construction of this kind of brake. Usually mounted on the wheel axle, the external form of this brake is of a cylindrical drum. Larger radii are used to extend the surface used for braking - usually the inner circumferential surface of the cylinder. Inside the drum are a pair of semi circular brake pads made of high friction and high wear resistance materials. The brake pads are semi-circular and are mounted on a metal shoe and...
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