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vacuum booster

noun
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Definition of vacuum booster

: a piston actuated by the vacuum of the intake manifold and attached to the brake pedal of an automotive vehicle to apply added pressure on the brake cylinder

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“Vacuum booster.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/vacuum%20booster. Accessed 5 Mar. 2021.

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