Vacuum servo

A vacuum servo is a component used on motor vehicles in their braking system, to provide assistance to the driver by increasing the braking effort.

It is used on virtually all vehicles which use hydraulic brakes for their primary braking circuit. Vacuum servos are not used on vehicles which use cables, rods (or other mechanical linkages), or pressurised air systems for their primary brake circuits.

It utilises a stored vacuum to multiply braking force applied by the driver to the brake pedal, before applying the transferred force to the brake master cylinder.

The vacuum is generated in two distinct methods, dependent on the type of internal combustion engine, or other motive force (as in electric vehicles). In petrol engines, the manifold vacuum is utilised, whereas in diesel engines, a separate vacuum pump is used. The the vacuum is transferred to the servo along semi-rigid plastic lines, and is stored in the servo by utilising a non-return valve.

External links

* [ "Brake Booster Info"]
* [ "How Stuff Works"]

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