A brake drum is a cast iron shaped like a tambourine that is fixed to the tire and rotates at the same speed. When braking, the oil pressure is used to push the brake shoe (brake)
Contact with the inner edge of the brake drum, the friction generated by contact to restrain the rotation of the tire to achieve the purpose of braking. Drum brake is composed of brake bottom plate,
brake sub pump, brake shoe and other related connecting rod, spring, pin and brake drum. At present, it is only commonly used in the rear wheel. Drum brakes,
which have lower cost and higher absolute braking force, are widely used in the rear wheels of small cars.
But its wear rate is higher, so the overall cost is higher at the same time
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