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Drum brakesIn the automotive sector, there are two main types of brakes: the drum brake and the disc brake, the drum brake being more common on older vehicles and trailers and on modern vehicles in general was replaced by the disc brake. Even with heavy commercial vehicles, the drum brake is still used, but is generally increasingly replaced by disc brakes.
The invention of the drum brakeDrum brakes and disc brakes were invented around the same time, at the end of the 19th century.
The principle of the drum brakeIn the case of a drum brake, the brake pads, as the name implies, press against a drum and not against a disc, as with the disc brake. The brake drum has a cylindrical shape and is firmly connected to the wheel so that it rotates while spinning the wheel. During braking, the pressure of the brake pads (in the vehicle area) is exerted on the inside of the drum. This is done via the so-called brake shoes on which the brake pads are applied.
The brake shoes are located inside the brake drum and are pressed apart during braking, usually by the hydraulic pressure, by means of a piston and against the brake drum.
Advantages of the drum brakeAbove all, the advantages of a drum brake over a disc brake are that less pressure is required during braking to achieve the same braking performance. In addition, due to the inner surface of the drum brake less dirt particles and dust on the brake shoes, which is why the drum brake in off-road vehicles and construction vehicles is still used. Another advantage of the drum brake is its longevity. The drum brake is also cheaper to manufacture.
However there are also disadvantages of drum brakes. A drum brake dissipates heat worse than a disc brake. In addition, a drum brake is usually heavier and the maintenance is more time-consuming, as in an inspection and cleaning always the entire drum must be removed.
Drum brakes are available in different variants, such as simplex drum brake, duplex drum brake, duo-duplex drum brake, servo brake and duo servo brake. In the servo drum brakes, the braking force is amplified by a pressure pin. The duo drum brakes have two wheel cylinders.