LEMON Manuals: Even more car manuals for everyone
Home >> Audi >> 2020 >> S4 Prestige >> Repair and Diagnosis >> External Pages >> Different car >> Section 79 (Hydraulic Components (Brake System) (1 Of 2)) >> 47 Hydraulic Components >> Brake Booster/Brake Master Cylinder >> Brake Booster, Removing And Installing >> Installing

Brake Booster, Removing And Installing: Installing

WARNING: This page is about a different car, the 2021 Audi S4 and 2021 Audi A4 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

Install in reverse order of removal and note the following:

Always replace the self-locking nuts and bolts.

Replace damaged bolts and nuts.

Clean the bolts and nuts before reusing.

-- Check that the boot -2- has not slipped out of the surrounding groove -arrow- on the brake booster -1- as shown.

GWWA47-10254Courtesy of AUDI OF AMERICA, LLC

-- Install the brake booster with the master brake cylinder.

Always replace the self-locking nuts and bolts.

Replace damaged bolts and nuts.

Clean the bolts and nuts before reusing.

-- Install the bolts -arrows- and tighten to the required tightening specification -Item  3-.

GWWA46-10270Courtesy of AUDI OF AMERICA, LLC

-- Push the vacuum hose into the brake booster.

GWWA47-10253Courtesy of AUDI OF AMERICA, LLC

-- Install the Vacuum Sensor -G608- -2-. Refer to BRAKE BOOSTER PRESSURE SENSOR, REMOVING AND INSTALLING .

-- Slide the vacuum hose firmly onto the Vacuum Sensor -G608-.

-- Connect the connector -1- for the Vacuum Sensor -G608- and connector -4- for the Brake Lamp Switch -F-.

CAUTION:

Risk of destroying the brake lines by bending.

- Never change the shape of the brake lines.

-- Insert the brake lines into the brake master cylinder by hand.

-- Tighten the union bolts -3- for the brake lines to the required tightening specification -Item  1- and -Item  22-.

-- 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 .

-- Install the windshield wiper arms. Refer to WINDSHIELD WIPER ARMS, REMOVING AND INSTALLING .

-- Fill the brake fluid reservoir up to the "MIN" mark.

Fig 1: Brake Fluid Reservoir
GWWA47-10258Courtesy of AUDI OF AMERICA, LLC

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

-- Remove all cloths from the vehicle that were previously placed down.

-- Bleed the brake system. Refer to HYDRAULIC SYSTEM, BLEEDING .

CAUTION:

Faulty brakes increase the risk of an accident.

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