American Heritage
Science Dictionary
disk brake  
Another spelling of disc brake.
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
In your question, you have mixed up parts of a disk brake system with parts of a drum brake system.
Pads are part of the a disk brake, and the drum is part of a drum brake.
The turbine features a fail-safe disk brake to prevent over speeding and to protect the generator.
The disk brake was an add on, that was not required.
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