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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) (2 Of 2) >> 47 Hydraulic Components >> Brake Booster/Brake Master Cylinder >> Brake Fluid Reservoir, Removing And Installing >> Removing

Brake Fluid Reservoir, Removing And Installing: Removing

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

WARNING:

Health risks!

  • Brake fluid is poisonous, and must never be siphoned by mouth under any circumstances.
  • To prevent skin contact with brake fluid, wear chemical resistant safety gloves.
  • Follow all disposal regulations.

Brake fluid contact with fluids containing mineral oils causes malfunctions.

  • Brake fluid must never come into contact with fluids containing mineral oils (oil, gas, cleaning solutions). Safety gloves must be free of oil and grease.

Risk of damaging the painted surfaces.

  • Due to its corrosive nature, brake fluid must also never contact paint. Wash off any spilled brake fluid immediately with plenty of water.

-- Open the brake fluid reservoir.

-- Extract as much brake fluid as possible from the brake fluid reservoir using the :VAS5234  with the :VAS5234/1  .

Fig 1: Identifying Brake Charger/Bleeder Unit VAS5234
GWWA47-10166Courtesy of AUDI OF AMERICA, LLC

-- To prevent brake fluid from escaping, place enough lint-free cloths in the area under the brake fluid reservoir.

Vehicles with Manual Transmission

-- Remove the return hose -1- to the clutch master cylinder, seal it with the :T10249  and tie it up.

Fig 2: Identifying Supply Hose & Seals
GWWN30-10128Courtesy of AUDI OF AMERICA, LLC

Continuation for All Vehicles

-- Disconnect the connector -2- for the Brake Fluid Level Warning Switch -F34-.

GWWA47-10257Courtesy of AUDI OF AMERICA, LLC
NOTE:

To prevent brake fluid from escaping, place enough lint-free cloths in the area under the brake master cylinder.

-- Remove the locking pin -arrow- on the side of the brake fluid reservoir and from the brake master cylinder.

GWWA47-10257Courtesy of AUDI OF AMERICA, LLC

-- Remove the brake fluid reservoir -1- from the plugs.

-- Seal the open lines and connections immediately with plugs from the Assembly Part Set :5Q0 698 311  .