Drum brakes incorporate a rotating drum that houses brake shoes. When the driver applies the brake pedal, hydraulic pressure forces these shoes against the inner surface of the drum, creating friction that slows down or stops the vehicle. This mechanism is particularly effective in providing consistent braking performance, especially under load. As such, drum brakes are commonly found in older vehicles and are still used in various models today, particularly in the rear braking systems of trucks and other heavy-duty vehicles.