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((Short description|Car part))
((Refimprove|date=February 2017))
[[Image:2008-05-05 1990 Geo Storm GSi vacuum servo.jpg|thumb|right|Brake booster from a [[Geo Storm]].]]
[[Image:Servofreno seccionado.jpg|thumb|right|Brake vacuum servo section]]
A '''vacuum servo''' is a component used on [[motor vehicle]]s in their [[brake|braking]] system, to provide assistance to the driver by decreasing the braking effort. In the US it is commonly called a '''brake booster'''.

A vacuum servo also known as a power booster or [[power brake]] unit uses a vacuum to multiply the driver's pedal effort and apply that effort to the [[master cylinder]]. <ref>((Cite web|url=http://www.edumech.co.uk/brakes-hydraulic/4591385319|title=Brakes - Hydraulic - EduMech|website=www.edumech.co.uk|access-date=2016-04-25 |url-status=dead |archive-url=https://web.archive.org/web/20160425204917/http://www.edumech.co.uk/brakes-hydraulic/4591385319 |archive-date=2016-04-25))</ref> It can not be used when the engine is off, mostly after a few attempts.((clarify|reason=I think this means "residual pressure is short-lived without engine support".|date=April 2023))

== See also ==
*[[List of auto parts]]
== Notes ==
((reflist))

== External links ==
* [https://autorideofreading.com/blog/what-is-a-brake-booster/ What is a brake booster?]
*[https://auto.howstuffworks.com/auto-parts/brakes/brake-types/power-brake.htm "How Power Brakes Work"], (a 4-page basic tutorial article, with illustrations & animation) at HowStuffWorks.com

((CarDesign nav))
((Powertrain))

[[Category:Brakes]]


((Automotive-part-stub))

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