A
disc brake is a type of
brake that uses calipers to squeeze pairs of pads against a disc in order to create
friction that retards the rotation of a shaft, such as a
vehicle axle, either to reduce its rotational speed or to hold it stationary. The energy of motion is converted into
waste heat which must be dispersed.
Hydraulic disc brakes are the most commonly used form of brake for motor vehicles but the principles of a disc brake are applicable to almost any rotating shaft.