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Home >> Audi >> 2022 >> S8 >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Components (Brakes) >> 47 Hydraulic Components >> Brake Booster/Brake Master Cylinder >> Brake Booster, Removing And Installing >> Brake Booster, Removing And Installing, Vacuum Brake Booster >> Removing

Brake Booster, Removing And Installing, Vacuum Brake Booster: Removing

-- Switch off the ignition.

-- Reduce the vacuum in the brake booster by pressing the brake pedal repeatedly.

-- Disconnect the brake pedal from the brake booster. Refer to BRAKE PEDAL, DISCONNECTING FROM BRAKE BOOSTER .

-- Remove the plenum chamber bulkhead. Refer to PLENUM CHAMBER BULKHEAD, REMOVING AND INSTALLING .

-- Remove the brake fluid reservoir. Refer to BRAKE FLUID RESERVOIR, REMOVING AND INSTALLING .

LHD vehicle

GWWA46-10268Courtesy of AUDI OF AMERICA, LLC

-- Remove the brake lines -arrows- from the bracket -1-.

CAUTION:

Risk of destroying the brake lines by bending.

- Never change the shape of the brake lines.

- A damaged or bent brake line must be replaced.

-- LHD: disconnect the connector -1- and remove Vacuum Sensor -G608-. Refer to BRAKE BOOSTER PRESSURE SENSOR, REMOVING AND INSTALLING .

GWWA47-10295Courtesy of AUDI OF AMERICA, LLC

-- Disconnect the connector -4- for the Brake Pedal Switch -FX2-.

-- Pull the vacuum hose -2- off of the brake booster and remove it; do not damage it while doing so.

-- To protect against escaping brake fluid, place enough lint-free cloths in the area below the brake booster.

CAUTION:

Leaking brake fluid increases the risk of injury.

Risk of skin irritation and injury.

- Wear safety gloves.

-- Remove the union bolts -3- for the brake lines, then remove the brake lines from the brake master cylinder and move them slightly to the side.

CAUTION:

Risk of destroying the brake lines by bending.

- Never change the shape of the brake lines.

- A damaged or bent brake line must be replaced.

-- Immediately close open connection points with a clean plug.

RHD vehicles

-- Free up the coolant hoses in the area of the brake booster.

Continuation for all vehicles 

GWWA46-10267Courtesy of AUDI OF AMERICA, LLC

-- Remove the bolts -arrows-.

-- Carefully pull the brake booster with the brake master cylinder out of the plenum chamber.