A3 L4-2.0L Turbo (BPY) (2006)
Vacuum Brake Booster: Service and Repair
Brake Booster/Brake Master Cylinder Assembly Overview
Brake Booster/Brake Master Cylinder Assembly Overview
‹› Brake master cylinder and brake boosters can be replaced independently of one another.
1 - Gasket
‹› For brake booster
2 - Brake booster
‹› Functional check
‹› With engine switched off, depress brake pedal firmly several times (to exhaust vacuum in the unit).
‹› Depress brake pedal with average foot pressure, hold and start engine. If the booster unit is working properly, the pedal will be felt to give
slightly under foot (booster assist becomes effective).
‹› Disconnect from brake pedal => [ Brake Pedal and Brake Booster, Separating ] See: Brake Pedal Assy/Service and Repair/Brake Pedal and
Brake Booster, Separating
‹› Removing and installing => [ Brake Booster ] See: Brake Booster
‹› If faulty, replace completely.
3 - Seal ring