#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
  part:  #hydraulic_brake_cylinder  #brake_pedal
  subtype:  #disk_brake__disc_brake  hydraulic brake in which friction is applied to both sides of spinning disk by the brake pads
  subtype:  #drum_brake__drum_brakes  hydraulic brake in which friction is applied to the inside of a spinning drum by the brake shoe
  subtype:  #foot_brake  hydraulic brake operated by pressing on a foot pedal

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