| Noun | 1. | drum brake - hydraulic brake in which friction is applied to the inside of a spinning drum by the brake shoebrake drum, drum - a hollow cast-iron cylinder attached to the wheel that forms part of the brakes brake shoe, skid, shoe - a restraint provided when the brake linings are moved hydraulically against the brake drum to retard the wheel's rotation hydraulic brake, hydraulic brakes - brake system in which a brake pedal moves a piston in the master cylinder; brake fluid then applies great force to the brake pads or shoes | |