There are two types of drum brakes, single leading edge and double leading edge. Both types have two semicircular brake shoes that sit inside a spinning drum. The drum is attached to the wheel so that when the brake is applied, the shoe pushes out against the inside of the drum causing the heat and friction required to stop the car. The difference between the two is that a single leading edge makes contact with only one part of the drum and a double leading edge makes contact with two parts of the drum.
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