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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 Master Cylinder, Removing And Installing >> Installing

Brake Master Cylinder, 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.

Always replace the self-locking nuts and bolts.

Replace damaged bolts and nuts.

Clean the bolts and nuts before reusing.

-- When inserting the brake master cylinder -1-, make sure that the pressure rod -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 downward slightly. This allows the brake master cylinder to be guided into the pushrod more easily.

-- Install the tower brace. Refer to TOWER BRACE, REMOVING AND INSTALLING .

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

-- 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.