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Home >> Audi >> 2016 >> S5 Prestige, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 632 (Brake System - Hydraulic Components) >> 47 Hydraulic Components >> Brake Booster/Brake Master Cylinder >> Brake Booster, Removing And Installing >> Removing

Brake Booster, Removing And Installing: Removing

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-- 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.

-- Separate the brake pedal from brake booster, refer to BRAKE PEDAL, REMOVING FROM BRAKE BOOSTER .

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

Applies to hybrid vehicles 

WARNING:

Follow the High Voltage System General Warnings, refer to HIGH VOLTAGE SYSTEM GENERAL WARNINGS .

-- Remove the Electric A/C Compressor High Voltage Cable -P3- from the plenum chamber bulkhead, refer to ELECTRICAL A/C COMPRESSOR HIGH VOLTAGE CABLE, REMOVING AND INSTALLING .

Continuation for all vehicles 

-- Remove the plenum chamber bulkhead, refer to OVERVIEW - BULKHEAD .

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

WARNING:
  • Brake fluid is poisonous. NEVER siphon brake fluid with your mouth!
  • Wash off any brake fluid that comes into contact with the skin with a lot of water.
  • If brake fluid comes in contact with the eyes, wash out the eye(s) and see a doctor.
  • Refer to BRAKE FLUID GENERAL INFORMATION 

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

Fig 1: Brake Booster Bolts, Brake Lines & Brake Master Cylinder Bolts
GWWA47-0186Courtesy of AUDI OF AMERICA, LLC

-- Remove master brake cylinder

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

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

Fig 2: 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 3: Brake Booster Bolts, Brake Lines & Brake Master Cylinder Bolts
GWWA47-0186Courtesy of AUDI OF AMERICA, LLC

-- Remove the brake booster from the vehicle.