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Home >> Audi >> 2016 >> A4 Premium Plus >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Brake System - Hydraulic Components (Sedan) (As Of 01.2014) >> 47 Hydraulic Components >> Brake Booster/Brake Master Cylinder >> Brake Booster, Removing And Installing >> Removing

Brake Booster, Removing And Installing: Removing

-- 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
GWWA68-10158Courtesy of AUDI OF AMERICA, LLC

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

Fig 2: Identifying Footwell Vents
GWWA87-10491Courtesy of AUDI OF AMERICA, LLC

-- 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
GWWA47-0186Courtesy 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
GWWA47-10019Courtesy 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
GWWA47-0186Courtesy of AUDI OF AMERICA, LLC

-- Remove the brake booster from the vehicle.