brake block

English

A brake block on a horse omnibus

Noun

brake block (plural brake blocks)

(on a bicycle) one of two small blocks fitted to a brake caliper, which rub on the wheel rim when the brake is applied.
(rail transport) a metal block fitted to locomotives or rolling stock, which rubs on the steel tyre of the wheel when the brake is applied.
a block (perhaps wooden) used for braking a horse-drawn vehicle.

References

“brake block” in Lexico, Dictionary.com; Oxford University Press.

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