Vacuum servo

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Brake booster from a Geo Storm.
Brake vacuum servo section

A vacuum servo is a component used on motor vehicles in their 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 drivers pedal effort and apply that effort to the master cylinder. [1] It can not be used when the engine is off, mostly after a few attempts.


  1. ^ "Brakes - Hydraulic - EduMech". Archived from the original on 2016-04-25. Retrieved 2016-04-25.

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