A heavy metal covering fitted over an automotive brake assembly and fastened to the axle: used in a braking system (drum brakes) in which internal brake shoes are pushed outward to contact the spinning drum from the inside.
Webster's New World
Any rim that rotates rapidly in a braking assembly.
A road maybe used as a self-acting or gravitating incline when the gradient is r in 30 or steeper, in which case the train is lowered by a rope passing over a pulley or brake drum at the upper end, the return empty train being attached to the opposite end of the rope and hauled up by the descending load.
I knew something was wrong when the brake drum and hub flange came off still attached to the wheel.
A vibrating brake pedal can indicate a brake drum that is warped.