brake drum

noun
a narrow metal cylinder, fixed to a rotating shaft or wheel, against which brake shoes or brake bands act.

Origin:
1895–1900

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
brake drum
 
n
See also brake shoe the cast-iron drum attached to the hub of a wheel of a motor vehicle fitted with drum brakes

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
If a brake drum or rotor is severely worn, replacement is required.
When the brakes are applied, the shoes are pushed outward against the inside of
  the cylindrical brake drum.
Some brake dust can be seen when a brake drum is removed from a car, truck, or
  other equipment.
The brake drum was removed and the wear surfaces of the drum and linings were
  visually inspected.
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