Page created by T August 18th 2007:
A Brake Booster uses vacuum from the Inlet Manifold to power the Brakes.
Within the Booster lies a Valve that keeps the vacuum from the Inlet Manifold applied to both sides of a Diaphragm until the Brake Pedal is pushed.
Applying the Brakes:
When the Brake Pedal is pushed the Valve allows Air from the Atmosphere to appear on the Driver's side of the Diaphragm pushing it towards the Master Cylinder.
The Applied Position:
When the Diaphragm has reached the current Pedal position the Valve cuts off the supply of atmospheric air to the Diaphragmwhich stops it from moving any further.
Releasing the Brakes:
When the Brake Pedal is released the Valve releases the air trapped behind the Diaphragm and allows it to flow into the Inlet Manifoldand reapplies vacuum to both sides of the Diaphragm. The Diaphragm then returns to the relaxed position.A small Air Filter at the rear of the Booster prevents dirt from entering the Booster and ultimately the Inlet Manifold.