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Two-wheelers such as Scooters, commuter Bikes, three-wheelers including auto-rickshaws widely use the Drum Brake system for braking. This type of brake system is used on the rear wheels of most hatchback cars, entry-level sedans & MUVs. It is also widely used on both front & rear wheels of trucks, buses, and other commercial vehicles in combination with hydraulic/pneumatic (either air-pressure or vacuum) brake actuating systems. This system is also known as the ‘Internal Expanding Shoe Type’ brake system. This type of brake got its name from the drum structure of cylindrical-shape. Inside this drum, the parts of the conventional drum-brake system are housed. Hence, the name. In the mechanical system such as in two-wheeler & an auto-rickshaw, the brake shoes are actuated by a cam, which is attached to the brake linkage & pedal. When you press the brake pedal, the cam turns. Thus, it causes the brake shoes to expand outwards and rub against the drum. The friction between the brake linings and the drum causes the drum to stop rotating; thereby stopping the wheel. When you release the brake pedal, the retracting springs bring the brake shoes back to their original position. This results in a gap between them and the drum and to again spin it freely.