Power-brake

power brake

noun
an automotive brake set by pressure from some power source, as a compressed-air reservoir, in proportion to a smaller amount of pressure on the brake pedal.

Origin:
1895–1900

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
power brake

noun
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 
WordNet® 3.0, © 2006 by Princeton University.
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