master cylinder
noun
the hydraulic pump of an automotive braking system that contains a cylinder and one or two pistons, is actuated by the brake pedal, and supplies hydraulic fluid under pressure to the brakes at each wheel.
Words nearby master cylinder
British Dictionary definitions for master cylinder
master cylinder
noun
a large cylinder in a hydraulic system in which the working fluid is compressed by a piston enabling it to drive one or more slave cylinders
See also slave cylinder