1. 
   vacuum brake
   (from the article `railroad`) There are two principal types of continuous train braking system: vacuum, which now survives mostly on Third World railroads, and compressed air, the ...
   Found op http://www.britannica.com/eb/a-z/v/1
   
   
2. 
   Vacuum brake
   The vacuum brake is a braking system employed on trains and introduced in the mid-1860s. A variant, the automatic vacuum brake system, became almost universal in British train equipment and in those countries influenced by British practice. Vacuum brakes also enjoyed a brief period of adoption in t...
   Found op http://en.wikipedia.org/wiki/Vacuum_brake
   
   
3. 
   vacuum brake
   a mechanical brake in which the friction members are actuated by a controlled variable vacuum acting against a relatively constant higher vacuum
   Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=811-06-16
   
   
4. 
   Vacuum Brake
   A vacuum brake is a type of brake largely used on railway trains. It acts by the differences of pressure on each side of a piston in an exhausted air chamber.
   Found op http://www.probertencyclopaedia.com/browse/GV.HTM
   
   

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