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vacuum brake

noun
  1. a brake system, used on British and many overseas railways, in which the brake is held off by a vacuum on one side of the brake-operating cylinder. If the vacuum is destroyed by controlled leakage of air or a disruptive emergency, the brake is applied. It is now largely superseded by the Westinghouse brake system
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for vacuum brake

Historical Examples

  • In the 1886 tests there were five competitors—three buffer-brakes, one compressed-air brake, and one vacuum-brake.

    Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 4

    Various