Brake fluid: Changing: Notes

WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 2009 Audi S4, 2009 Audi A4, 2008 Audi S4, 2008 Audi RS 4, and 2008 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Special tools, testers, and measuring equipment

Fig 1: Identifying Brake Filler And Bleeder Unit VAS 5234

Courtesy of VOLKSWAGEN UNITED STATES, INC.

VAS 52.4 Brake filling and bleeding tool

Fig 2: Identifying Brake Filler And Bleeder Unit V.A.G 1869

Courtesy of VOLKSWAGEN UNITED STATES, INC.

V.A.G 1869 Brake filling and bleeding tool with Adapter set V.A.G 1869/4

NOTE:

Use only new Original VW / Audi brake fluid, see ETKA

WARNING:

Brake fluid must never come into contact with fluids containing mineral oils (oil, gas, cleaning solutions). Oils containing minerals damage seals and sleeves on brake systems.
Brake fluid is poisonous. Due to its caustic nature, it must also never be brought into contact with paint.
Brake fluid is hygroscopic, which means that it absorbs moisture from the air. Always store brake fluid in air-tight containers.
Wash off brake fluid spillage using plenty of water.

Observe waste disposal regulations!

Observe operating instructions for VAS 52.4 or for V.A.G 1869 !

Fig 3: Identifying Brake Fluid Reservoir Cap

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove brake fluid reservoir cap - 1 -.

WARNING:

The strainer in the brake fluid reservoir must not be removed.

Remove brake fluid reservoir plug - arrow -.

Fig 4: Connecting Suction Hose From VAS 52.4 Or V.A.G 1869 To Tube Of Brake Fluid Reservoir

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Connect suction hose from VAS 52.4 or V.A.G 1869 to tube - 1 - of brake fluid reservoir.
Extract as much brake fluid as possible using suction hose from VAS 52.4 or from V.A.G 1869 or with extractor bottle.
Disconnect suction hose.

Fig 5: Connecting Suction Hose From VAS 52.4 Or V.A.G 1869 To Tube Of Brake Fluid Reservoir

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Connect suction hose from VAS 52.4 or V.A.G 1869 to tube - 2 - of brake fluid reservoir.
Extract as much brake fluid as possible using suction hose from VAS 52.4 or from V.A.G 1869 or with extractor bottle.
Disconnect suction hose.
Install brake fluid reservoir plug.

WARNING: Do not reuse, (used) extracted brake fluid.

Fig 6: Connecting Filler Hose From VAS 52.4 Or V.A.G 1869 To Adapter

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Install adapter - 1 - to brake fluid reservoir.
Connect filler hose - 2 - from VAS 52.4 or V.A.G 1869 to adapter.

Vehicles with manual transmission:

Pull cover cap off clutch slave cylinder bleed screw.

Fig 7: Connecting Filler Hose From VAS 52.4 Or V.A.G 1869 To Adapter

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Place extractor bleeder hose - 1 - on clutch slave cylinder bleeder screw, open bleeder screw, and let about 100 ml drain out. Close bleeder screw and install cover cap.
Operate clutch pedal several times.

Continued for all vehicles:

Remove caps from the bleeder screws.
Connect extractor bleeder hose - 1 - to front left bleeder screw, open bleeder screw and allow about 2.0 ml to flow out. Close bleeder screw.

Repeat work sequence on other side of vehicle at front.

Fig 8: Identifying Fluid Level

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Connect extractor bleeder hose - 1 - to rear left bleeder screw, open bleeder screw and allow about 2.0 ml to flow out. Close bleeder screw.

Repeat work sequence on other side of vehicle at rear.