power brake

Noun
  1. A brake on an automobile that magnifies a small force applied to the brake pedal into a proportionately larger force applied to slow or stop the vehicle (synset 104001376)
    is a type of: brake - a restraint used to slow or stop a vehicle
    subtypes: airbrake - a vehicular brake that operates by compressed air; especially for heavy vehicles
    is a part of: automotive vehicle, motor vehicle - a self-propelled wheeled vehicle that does not run on rails

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