The drum brake is used more, than any other brake design. Braking power is obtained, when the brake shoes are pushed against the inner surface of the brake drums, which rotates with the axle. Drum brakes are used mainly for the rear wheels of passenger cars and trucks however, they used to be used on all four wheels.
Brake drums are generally made of a special type of cast iron. It is positioned very close to the brake shoe, without actually touching it, and rotates with the wheel and axle. As the lining is pushed against the inner surface of the drum, friction is created, which slows the vehicle. The heat created from the friction process can reach as high as 600 degrees F. The brake drums must be accurately balanced, very strong, resistant against wear, heat-conductive and lightweight.
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