A drum brake is a brake that uses friction caused by a set of shoes or pads that press against a rotating drum-shaped part called a brake drum.
The term drum brake usually means a brake in which shoes press on the inner surface of the drum. When shoes press on the outside of the drum, it is usually called a clasp brake. 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. A related type called a band brake uses a flexible belt or "band" wrapping around the outside of a drum.
Read more about Drum Brake: History, Components, Self-applying Characteristic, Drum Brake Designs, Advantages, As A Tailshaft Parking/emergency Brake, Disadvantages, Re-arcing, Use in Music
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—Robert Benchley (1889–1945)