Drum brakes are also prone to brake fade with repeated use. Some designs have two wheel cylinders.Īs the shoes in drum brakes wear, brakes required regular manual adjustment until the introduction of self-adjusting drum brakes in the 1950s. From the mid-1930s, oil pressure in a small wheel cylinder and pistons (as in the picture) operated the brakes, though some vehicles continued with purely mechanical systems for decades. In the first drum brakes, levers and rods or cables operated the shoes mechanically. He used woven asbestos lining for the drum brake lining, as no alternative material dissipated heat more effectively, though Maybach had used a less sophisticated drum brake.
The modern automobile drum brake was first used in a car made by Maybach in 1900, although the principle was only later patented in 1902 by Louis Renault.
History Several schemes of drum brake operation the distribution force during the braking phase is highlighted in black. A related type called a band brake uses a flexible belt or "band" wrapping around the outside of a drum. Where the drum is pinched between two shoes, similar to a conventional disc brake, it is sometimes called a pinch drum brake, though such brakes are relatively rare. When shoes press on the outside of the drum, it is usually called a clasp brake.
The term drum brake usually means a brake in which shoes press on the inner surface of the drum. JSTOR ( July 2016) ( Learn how and when to remove this template message)ĭrum 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 motorcycleĪ drum brake is a brake that uses friction caused by a set of shoes or pads that press outward against a rotating cylinder-shaped part called a brake drum.
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