An explanation of how a vacuum brake servo/booster works in a car hydraulic brakes system.
A Vaccum 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.
The Servo unit is situated between the brake pedal and the master cylinder, and is failsafe. If the source of vacuum is lost or the unit fails for any other reason, there is a physical connection between the pedal and the master cylinder allowing the brakes to be applied, however, without assistance the braking force is reduced and the stopping distance will in turn increase.
To see how to test your own car, check out this video https://youtu.be/M2AnK8Q90Lo
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