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
What's Trending Now
More Trending Words
vacuum booster
noun
Indulge Your Inner Word Nerd
There's more!
Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.
Start your free trial today and get unlimited access to America's largest dictionary, with:
- More than 250,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Seen and Heard
What made you want to look up vacuum booster? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!