brake drum
- a heavy metal covering fitted over an automotive brake assembly and fastened to the axle: used in a braking system () in which internal brake shoes are pushed outward to contact the spinning drum from the inside
- any rim that rotates rapidly in a braking assembly
See brake drum in American Heritage Dictionary 4
noun A metal cylinder to which pressure is applied by a braking mechanism in order to arrest rotation of the wheel or shaft to which the cylinder is attached.
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