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Drum brake (upper right) with the drum removed (lower left, inside facing up), on the front of a Ford Falcon Sprint A rear drum brake on a Kawasaki W800 motorcycle. A drum brake is a brake that uses friction caused by a set of shoes or pads that press outward against a rotating bowl-shaped part called a brake drum.
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The principle of the S-cam allows the brakes of big vehicles to be more compact and less moving parts, since it only relies on a rotating shaft. Generally speaking, a tractor trailer requires more brakes than a typical vehicle, so making the brakes as simple and as cost effective as possible is very important. [citation needed]
US 2366093 Brake. Forbes Joseph A. 1944-12-26; US 2140752 Brake. La Brie 1938-12-20; US 2084216 V-type brake for motor vehicles. Poage Robert A. and Poage Marlin Z. 1937-06-15; US 2028488 Brake. Avery William Leicester 1936-02-21; US 1959049 Friction Brake. Buus Niels Peter Valdemar 1934-05-15; US 1954534 Brake. Norton Raymond J 1934-04-10
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A power braking system consists of several distinct components, including the vacuum booster, master cylinder, brake fluid reservoir and lines, and calipers (or drums). Power brakes have been around in some form since the 1920s, and since the late 20th century all cars sold in North America have been equipped with power brakes.
Compared to modern disc brakes, drum brakes wear out faster due to their tendency to overheat. The disc brake is a device for slowing or stopping the rotation of a road wheel. A brake disc (or rotor in U.S. English), usually made of cast iron or ceramic, is connected to the wheel or the axle.