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.
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World English Dictionary
master cylinder
 
n
See also slave cylinder 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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The majority of vehicles this time have a potential slow fluid leak problem
  with a seal in the brake master cylinder.
It attributed the problem to the braking system's secondary master cylinder.
If appropriate, check for brake fluid level in the master cylinder.
Surge brakes are independent hydraulic brakes activated by a master cylinder at
  the junction of the hitch and trailer tongue.
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