power brake

noun

1. 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.

Word History and Origins

Origin of power brake¹

First recorded in 1895–1900

Example Sentences

If the power brakes fail, the brakes would still work without the power assist.

From Seattle Times

It also has a 3-speed automatic transmission, power steering, power brakes and air conditioning, making it a consummate coastal cruiser.

From Fox News

It has no air conditioning and no seat belts, but it does have power steering and power brakes.

From Wall Street Journal

The power brake vacuum pump in the models can degrade and make it difficult to stop, according to the agency.

From Washington Post

Without power steering or power brakes, Holcy muscled the truck to the side of the highway.

From Washington Post