Brake fluid, changing: Procedure

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2005 Audi allroad, 2004 Audi allroad, 2004 Audi A6, 2003 Audi allroad, and 2003 Audi S6. However, it is still accessible from the selected car via links, so may be relevant.

Use new brake fluid with part number B 000 700 A (corresponds to US standard FMVSS 116 DOT 4)

NOTE:

Part numbers are for reference only! Check with parts department for correct part number.
Only use new brake fluid conforming to US standard FMVSS 116 DOT 4
Genuine VW/Audi brake fluid conforms to this specification.

WARNING:

Brake fluid is poisonous. Do not ingest brake fluid. Wash thoroughly with soap and water if brake fluid comes into contact with skin.
Use only new brake fluid conforming to US Standard FMVSS 116 DOT 4. Genuine VW/Audi brake fluid conforms to this specification.

CAUTION:

Do not let brake fluid come into contact with paintwork.
Brake fluid absorbs moisture from the surrounding air and should always be stored in airtight containers.

Note the following:

WARNING:

When changing the brake fluid with the VAS 5234 Brake filler and bleeder unit, care must be taken that the fill pressure of 1 bar is not exceeded.

For this reason the brake fluid pressure at the VAS 5234 Brake filler and bleeder unit must be adjusted down to 1 bar. See instruction manual for VAS 5234.

Observe instruction manual for VAS 5234!

Remove brake fluid reservoir cap.
Insert suction hose from VAS 5234 to extract as much brake fluid as possible from brake fluid reservoir.
Install VAG 1869/2 brake pedal depressor between driver's seat and brake pedal and apply tension.
WARNING: Do not reuse used / extracted brake fluid!
Install VAS 5234/1 Adapter to brake fluid reservoir.
Connect filler hose from VAS 5234 to VAS 5234/1 adapter.

Vehicles with manual transmission:

Pull cover cap off clutch slave cylinder bleed screw.
Connect collecting bottle bleeder hose -A- to bleeder screw of clutch slave cylinder (arrow), open bleeder screw and allow approximately 0.1 liter to flow out. Close bleeder screw and install cover cap.

Fig 1: Connecting Collecting Bottle Bleeder Hose To Bleeder Screw Of Clutch Slave Cylinder (Manual Transmission)

Courtesy of AUDI OF AMERICA, INC.

Operate clutch pedal several times.

Continued for all vehicles:

Pull cover caps off bleeder screws
Connect collecting bottle bleeder hose to rear right bleeder screw, open bleeder screw and allow the appropriate quantity to flow out (see SEQUENCE: BRAKE FLUID QUANTITY WHICH MUST FLOW OUT OF WHEEL CYLINDERS OR BRAKE CALIPERS: ), then close bleeder screw.
Repeat procedure on rear left bleeder screw.
Connect collecting bottle bleeder hose to front right bleeder screw, open bleeder screw and allow the corresponding quantity to flow out (see SEQUENCE: BRAKE FLUID QUANTITY WHICH MUST FLOW OUT OF WHEEL CYLINDERS OR BRAKE CALIPERS: ), then close bleeder screw.
Repeat procedure on front left bleeder screw.
Install cover caps on brake caliper bleeder screws.
Move filler lever on VAS 5234 to position -B- (see operating instructions).
Take filler hose off VAS 5234/1 adapter.
Remove adapter from brake fluid reservoir.
Check brake fluid level and top off if necessary.
Reinstall brake fluid reservoir cover.
Remove brake pedal depressor VAG 1869/2.
Check pedal pressure and brake pedal free play. Free play: max 1/3 of pedal travel.