It is a device to slow down or stop a moving vehicle or to keep it in the motionless state. It converts the vehicle's kinetic energy into thermal energy and puts brakes on the vehicle by using the driver's control or friction force caused the auxiliary power.
The brake consists of the brake lining, disc pad, and clutch facing in automobiles, industrial machinery, agricultural machinery, and trains. There are two kinds of materials used to make a brake friction material; one is the inorganic friction materials including ceramic and carbon composites, and the other is the organic ones including phenol and other organic chemicals.