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vacuum brake

   Also found in: Dictionary/thesaurus, Wikipedia 0.03 sec.
vacuum brake [′vakĀ·yəm ‚brāk]
(mechanical engineering)
A form of air brake which operates by maintaining low pressure in the actuating cylinder; braking action is produced by opening one side of the cylinder to the atmosphere so that atmospheric pressure, aided in some designs by gravity, applies the brake.


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The manifold is sealed with a spin-welded end cap (which also serves as a mounting bracket for the vacuum brake booster).
The 45% glass-reinforced PPA reduced both the weight [by 60%] and the wall thickness of the "power piston" of Delphi's new vacuum brake boosters when compared to traditional thermosets.
 
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