What is Drum Brake?

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Drum Brake:

A drum brake is a brake that uses friction caused by a collection of shoes or pads that press outward against a rotating cylinder-shaped part called a brake drum.

The term hydraulic brake usually means a brake in which shoes maintain the inner surface of the drum. When shoes go on the surface of the drum, it’s usually called a clasp brake. Where the drum is pinched between two shoes, kind of like standard hydraulic brakes, it’s sometimes called a pinch hydraulic brake, though such brakes are relatively rare. A related type called a band brake uses a versatile belt or “band” wrapping around the outside of a drum.

Usually, this brake is found within the rear wheels of the vehicle, while the disc brake is found at the front of the vehicle. A car may additionally have only drum brakes or disc brakes both front and rear.



When asbestos was common in drum brakes, a dangerous worker who was repairing or replacing them would breathe asbestos fibers, which may cause mesothelioma. Asbestos fibers would break off or become separated over time and with the high temperatures induced by braking. Wet brushes and aerosol sprays were commonly wont to reduce dust. Safety regulators sometimes recommended using vacuum hoses to suck away the dust, or enclosures with interior lighting and space to use tools inside them, but these were rare and cumbersome. Distinctive shoes designed to safeguard against asbestos were also recommended. there’s evidence that auto mechanics had disproportionate levels of mesothelioma.

Those who do maintenance work on brakes may also be exposed to the solvents 1,1,1-trichloroethane and 2-butoxyethanol (the main ingredient in Greasoff No. 19). Exposure to those solvents can irritate, including the eyes and mucous membranes. Exposure to 1-1-1-trichloroethane vapors can cause central systema nervosum damage, dizziness, incoordination, drowsiness, and increased time interval.

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