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vacuum servo


noun

a servomechanism that is operated by the lowering of pressure in the intake duct of an internal-combustion engine

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weal
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