LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Audi >> 2021 >> A4 Quattro Premium Plus, 2.0L Eng VIN B >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> 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

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.