Vacuum servo
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A vacuum servo (also called a brake booster, brake servo, 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.
The system was invented by Albert Dewandre[2] who, together variously with Bosch and Clayton-Dewandre Ltd. took out further patents as it was refined.[3]
See also
[edit]Notes
[edit]- ↑ "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.
- ↑ "History Bosch servo brakes". Bosch Global. Retrieved 23 October 2025.
- ↑ "Improvements in or relating to hydraulic braking systems". 30 March 1936. Retrieved 23 October 2025 – via google.
External links
[edit]- What is a brake booster? Archived 2023-12-28 at the Wayback Machine
- Nice, Karim (22 August 2000). "How Power Brakes Work". HowStuffWorks.com. Retrieved 2025-06-25.
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