disc brake

noun Automotive.
a brake system in which a disc attached to a wheel is slowed by the friction of brake pads being pressed against the disc by a caliper.
Also, disk brake.


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World English Dictionary
disc brake
a type of brake in which two calliper-operated pads rub against a flat disc attached to the wheel hub when the brake is applied

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
disc brake also disk brake   (dĭsk)  Pronunciation Key 

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A brake in which friction is caused by a set of pads, usually made of steel, that press against a rotating disk to slow or stop its rotation.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
However, shortly thereafter the axle shifted and the disc brake started rubbing
  against other parts.
The workers produced castings for brake drums and disc brake rotors.
The air disc brake configuration showed better performance in this test over
  the other configurations for stopping efficiency.
Disc brake stopping distance performance was better than that of drum brakes,
  and their frequency of repair was much lower.
Image for disc brake
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