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Drum Brake
From WikiPedalia
A drum brake is a hand-operated brake which is built into, or attached to the hub of a wheel, with shoes that press against the inside of a cylindrical drum.
The drum may be the inside of an oversized hub shell, or may be a separate unit which screws on to the side of the hub, by threads like those to which freewheels attach.
Drum brakes are common on automobiles and motorcycles, but fairly rare on bicycles, mainly due to their weight. The greatest advantage of a drum brake is that it is unaffected by rain. Drum brakes are commonly used as drag brakes on tandems. Also see the articles on Drum Brakes and on Tandem Brakes.
