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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 Master Cylinder, Removing And Installing >> Brake Master Cylinder, Removing And Installing, With Vacuum Brake Master Cylinder >> Installing

Brake Master Cylinder, Removing And Installing, With Vacuum Brake Master Cylinder: Installing

Install in the reverse order of removal while noting the following:

-- Install the Brake Pedal Switch -FX2-. Refer to Brake Pedal Position Sensor -G100-, REMOVING AND INSTALLING .

-- Make sure that the actuator pin -2- for the brake lamp is inserted in the brake master cylinder -1-. 

GWWN47-10420Courtesy of AUDI OF AMERICA, LLC

-- The actuator pin -2- must be in the hole in the brake master cylinder -1- directly on the Brake Pedal Switch -FX2-.

-- Check the actuator pin; a damaged or bent actuator pin must be replaced.

-- The piston in the brake master cylinder is not secured. Make sure it does not fall out.

-- When inserting the brake master cylinder -1-, make sure that the primary piston -3- is seated correctly in the brake booster -2-.

GWWA47-10256Courtesy of AUDI OF AMERICA, LLC

-- If necessary, have a second technician press the brake pedal slightly. This allows the brake master cylinder to be guided into pressure rod more easily.

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

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

CAUTION:

Faulty brakes increase the risk of an accident.

- Make sure the brakes are working correctly before driving the vehicle for the first time.