#hydraulic_brake__hydraulicbrake__hydraulic_brakes  brake system in which a brake pedal moves a piston in the master cylinder; brake fluid then applies great force to the brake pads or shoes
  supertype:  #brake_system__brakesystem__brakes__brake  brake consisting of a combination of interacting parts that work to slow a motor vehicle
  subtype:  #disk_brake  #drum_brake  #foot_brake
  part:  #hydraulic_brake_cylinder__hydraulicbrakecylinder__brake_cylinder__brakecylinder__master_cylinder  a cylinder that contains brake fluid that is compressed by a piston
  part:  #brake_pedal__brakepedal  foot pedal that moves a piston in the master brake cylinder

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