Brake Booster, Removing And Installing: Removing

WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 2016 Audi S4, 2016 Audi A4 Quattro, 2016 Audi A4, 2015 Audi S4, and 2015 Audi A4 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

-- Switch the engine off.

-- Press the brake pedal until there is no more brake assistance - "pump the brake booster empty". The brake pedal becomes hard.

-- Remove the driver side storage compartment -1 to 3-.

Fig 1: Identifying Driver Side Storage Compartment

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-- Disconnect the connector -C- on the footwell vent.

Fig 2: Identifying Footwell Vents

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-- Remove the footwell vents -A-B-.

-- Remove the brake lamp sensor. Refer to BRAKE LAMP SENSOR, REMOVING AND INSTALLING .

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

-- Remove the engine cover.

-- Remove the plenum chamber cover. Refer to PLENUM CHAMBER COVER, REMOVING AND INSTALLING .

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

-- Remove the plenum chamber bulkhead. Refer to OVERVIEW - BULKHEAD .

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

-- Remove the brake master cylinder at the nuts -3- BRAKE MASTER CYLINDER, REMOVING AND INSTALLING .

Fig 3: Brake Booster Bolts, Brake Lines & Brake Master Cylinder Bolts

Courtesy of AUDI OF AMERICA, LLC

-- Remove the brake master cylinder from the vehicle.

-- Place the brake master cylinder so no brake fluid can drain out.

-- Remove the vacuum line -3- from the brake booster.

Fig 4: Identifying Brake Master Cylinder Bolts

Courtesy of AUDI OF AMERICA, LLC

-- Remove the bolts mounting the brake booster -1- to the mounting bracket.

Fig 5: Brake Booster Bolts, Brake Lines & Brake Master Cylinder Bolts

Courtesy of AUDI OF AMERICA, LLC

-- Remove the brake booster from the vehicle.