emergency brake

noun
1.
Also called parking brake. a special brake used to prevent a motor vehicle from rolling after it has stopped or been parked. Compare brake1 ( def 1 ).
2.
any brake meant to stop a vehicle in an emergency.

Origin:
1895–1900

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To emergency brake
Example sentences
Some trailers use an air applied emergency brake system and some trailers use
  spring brakes as the emergency brake system.
All vehicles shall have a service brake system, an emergency brake system, and
  a parking brake system.
The emergency brake system shall be applied and released, and be capable of
  modulation, by means of the service brake control.
Air brakes are really three different braking systems: service brake, parking
  brake, and emergency brake.
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