Special authentic automobile brake drums, automotive brake drums price, automobile brake drum technology. The brake drum is cast iron of a shape similar to a tambourine, and the tire fixed and rotating with the speed. Promote the use of hydraulic brake shoe Brake Shoes to contact the inner edge of the brake drum brake, by the friction generated by the contact inhibition of tire rotation in order to achieve the purpose of the brake. Drum brakes from the brake plate, brake wheel cylinders, brake shoe, such as connecting rods, springs, pegs, brake drum composition. Common use only in the rear wheel. Drum brakes, lower cost, higher power of an absolute system, more use in the rear wheel of small cars. But the high wear rate, and therefore a higher overall cost.