noun
a cylinder that contains brake fluid that is compressed by a piston
• Syn: ↑brake cylinder, ↑hydraulic brake cylinder
• Hypernyms: ↑cylinder, ↑piston chamber
• Part Holonyms: ↑hydraulic brake, ↑hydraulic brakes
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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.
Useful english dictionary. 2012.