Brake Fluid, Changing: Notes

WARNING:

Warning information for the high voltage system:

Procedures for which the ignition needs to be switched off. Refer to PROCEDURES FOR WHICH THE IGNITION NEEDS TO BE SWITCHED OFF .

NOTE:

Use only new Original VW / Audi brake fluid .

WARNING:

Brake fluid must never come into contact with fluids containing mineral oils (oil, gas, cleaning solutions). Oils containing minerals damage seals and rubber grommets on brake systems.
Brake fluid is poisonous. Do not let brake fluid come into contact with paintwork.
Brake fluid is hygroscopic, meaning that it absorbs moisture from the surrounding air, and must therefore always be stored in air-tight containers.
Rinse off any leaking brake fluid with water.
Do not reuse used / extracted brake fluid!
Follow all disposal regulations.

Special tools and workshop equipment required

Brake Filler and Bleeder Unit VAS 5234

Fig 1: Brake Filler and Bleeder Unit VAS 5234
Courtesy of AUDI OF AMERICA, LLC
Reservoir

Fig 2: Identifying Fluid Reservoir/Container
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Tool Set for Brake Bleeding VAS 6564

Fig 3: Brake Bleeder Tool Set VAS 6564
Courtesy of AUDI OF AMERICA, LLC

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

Fig 4: Locating Brake Fluid Reservoir Cap

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-- Extract as much brake fluid as possible using intake hose from the Brake Charger/Bleeding Unit VAS 5234 with an installed screen.

Fig 5: Extracting Brake Fluid Using Brake Charger/Bleeding Unit VAS 5234

Courtesy of AUDI OF AMERICA, LLC

-- Install the adapter -1- to the brake fluid reservoir.

Fig 6: Installing Adapter -1- To Brake Fluid Reservoir

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-- Connect filler hose -2- on Brake Charger/Bleeder Unit VAS 5234 to adapter.

-- Adjust for the correct pressure on the Brake Charger/Bleeder Unit VAS 5234 (see owner's manual).

NOTE:

Depending on the vehicle equipment, the rear brakes or front wheel and rear wheel brakes may be bled without removing the tires using the Brake Bleeding Tool Set VAS 6564.

It is required to remove the wheels for specific tire combinations.

Use the bleeder hose delivered with the vehicle. The bleed hose must fit tightly over the bleed screw to prevent air from getting into the brake system.

If there are two bleeder screws (depending on the vehicle equipment) per brake caliper, first connect the inner bleeder screw and then the outer.

The brake fluid level in the reservoir must be high enough so that air cannot get into the brake system.

Do not remove the strainer inside the brake fluid reservoir.

After extracting, observe that no further brake fluid runs into the reservoir (the brake fluid level in the reservoir must align with the lower edge of the strainer).

Front Axle

Vehicles with: Brake caliper with two bleed screws

-- Remove the cap -1- from the bleed screw on the left front brake caliper.

Fig 7: Locating Front Brake Caliper Bleeder Screw Cap

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-- Attach the bleed hose container -1- to the bleeder screw on the inside of the wheel rim.

Fig 8: Identifying Collector Bottle Bleeder Hose

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-- Open the bleed screw and let the brake fluid drain out, refer to SEQUENCE AND BRAKE FLUID CAPACITY TABLE .

-- Close bleeder screw.

-- Reattach the brake caliper bleeder screw cap.

-- Repeat the steps for the front right.

Rear Axle

Vehicles with: Brake caliper with two bleed screws

-- Remove both bleeder screw caps -1- from the rear left brake caliper.

Fig 9: Locating Bleeder Screw Cap (Rear Brake Caliper)

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-- Select the Brake Bleeding Tool Set VAS 6564 ratchet and the corresponding socket wrench and connect them.

-- Guide the bleed hose -1- out of the Brake Bleeding Tool Set VAS 6564 from the inside of the wheel rim through the ratchet -2- and the socket wrench -3-, and attach it to the bleeder screw.

Fig 10: Bleeding Rear Brakes

Courtesy of AUDI OF AMERICA, LLC

-- Open the bleed screw with the ratchet -2- and drain the brake fluid, refer to SEQUENCE AND BRAKE FLUID CAPACITY TABLE .

-- Close bleeder screw.

-- Guide the bleed hose -1- out of the Brake Bleeding Tool Set VAS 6564 from the outside of the wheel rim through the ratchet -2- and the socket wrench -3-, and attach it to the bleeder screw.

Fig 11: Bleeding Rear Brakes

Courtesy of AUDI OF AMERICA, LLC

-- Open the bleed screw with the ratchet -2- and drain the brake fluid, refer to SEQUENCE AND BRAKE FLUID CAPACITY TABLE .

-- Close bleeder screw.

-- Install the bleeder screw cap on the brake caliper.

-- Repeat the steps for the rear right.

Manual Transmission

-- Bleed the clutch slave cylinder, if equipped with a manaul transmission .

-- Connect the bleed screw on the container -1- to the clutch slave cylinder, open the bleed screw and drain the corresponding brake fluid capacity.

Fig 12: Identifying Fluid Reservoir/Container

Courtesy of AUDI OF AMERICA, LLC

All Vehicles:

-- Move filler lever on Brake Charger/Bleeder Unit VAS 5234 to position -B- (see operating instructions).

-- Remove the filler hose from the adapter.

-- Remove the adapter from the brake fluid reservoir.

-- Check brake fluid level and fill if necessary.

Fig 13: Brake Fluid Reservoir Level MIN & Max Marks

Courtesy of AUDI OF AMERICA, LLC

-- Install the brake fluid reservoir cover -1-.

Fig 14: View Of Brake Fluid Reservoir Cap

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-- Check pedal pressure and brake pedal free play. Free play: max ¹ /₃ of pedal travel