9
Vehicle Dynamics and Driver Assist Systems
May 2017
Brake Vacuum Pump Systems
During normal braking the intake manifold vacuum creates a reservoir of negative pressure in
the power brake booster. A check valve located in the vacuum hose next to the booster traps
the negative pressure in the booster. This ensures that adequate negative pressure is available,
even during times when the intake manifold vacuum is reduced, to assist with the braking
application. Some vehicles require additional vacuum sources to provide consistent braking
application during low manifold vacuum conditions. To overcome this, these vehicles utilize
an additional vacuum pump to supplement the booster. Depending on the model/generation,
vehicles may use a mechanically driven or electric brake vacuum pump.
Push Rod
Filter
Silencer
Operating Rod
Poppet Valve
Valve Body
Plunger Valve
Diaphragm Plates
Valve Return Spring
Conventional Brake Booster
1-2
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