Vacuum servo

Car part

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Brake booster from a Geo Storm. Brake vacuum servo section

A vacuum servo (also called a brake booster, power booster, or power brake unit) is a component used on motor vehicles in their braking system, to provide assistance to the driver by decreasing the braking effort. It uses a vacuum, usually supplied by the engine, to multiply the driver's pedal effort and apply that effort to the master cylinder.[1]

Because the servo depends on the vacuum supplied by a running engine, a check valve is typically used in the vacuum line to maintain residual vacuum without engine support, allowing limited use even after parking.

## See also

[edit]

* List of auto parts

## Notes

[edit]

1. ^ "Learn about Hydraulic Brakes - How a vacuum brake servo/booster works". edumech.co.uk. Archived from the original on 2016-04-25. Retrieved 2025-06-25.

## External links

[edit]

* What is a brake booster? Archived 2023-12-28 at the Wayback Machine
* Nice, Karim. "How Power Brakes Work". HowStuffWorks.com. Retrieved 2025-06-25.

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