How do drum brakes primarily differ from disc brakes?
Drum brakes have one chamber. Disc brakes have two or more chambers.
Drum brakes use an S-cam. Disc brakes use a C-clamp.
Drum brakes use an S-cam to separate the brake shoes against the drum. Disc brakes use a caliper to squeeze the brake pads against the disc.
Drum brakes use two counter-rotating drums (or one drum is stationary) to apply braking force. Disc brakes separate the brake shoes using a disc.
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