Drums Modern automotive brake drums are made of heavy cast iron (some are aluminum with an iron or steel sleeve liner). With a machined surface inside against which the linings on the brake shoes generate friction when the brakes are, applied. This results in the creation of great deal of heat. The inability of drums to dissipate much heat as disc brakes is one. Of the main reasons discs have replaced drums at the front of all late - model cars and, light trucks and at the rear of some. Sports and luxury cars.
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