Audi Workshop Service and Repair Manuals

Special tools and workshop equipment required

• ◆ V.A.G 1331 Torque wrench
• ◆ V.A.G 1410 Torque wrench
• ◆ V.A.G 1869/2 Brake pedal depressor

Additionally required information

• ◆ Workshop Manual Audi A2 2000 ä Running Gear, Self-diagnosis for ESP; Steering

Fitting location:

The control unit is bolted to the hydraulic unit and is located at the left of the engine compartment.

→ Sealing plug, repair kit

After detaching the control unit from the hydraulic unit, the transport protection for valve domes must always be fitted onto the hydraulic unit.

No warranty can be accepted for hydraulic units without transport protection for valve domes.

•     1 -    Transport protection for valve domes (foam)
•     2 -     Sealing plug, M10
•     3 -     Sealing plug, M12

Removing

• ‒ Note radio code on vehicles with coded radio; if necessary ask for it.
• ‒ Disconnect battery.
• ‒ Fit brake pedal depressor V.A.G 1869/2
• ‒ Depress brake pedal using brake pedal depressor.

• ‒ → Open bracket -3- and unclip brake line.
• ‒ Lay out plenty of lint-free cloths under the control unit and the hydraulic unit.

• ‒ → Disconnect the brake lines from hydraulic unit -1- and seal brake lines and threaded holes with plugs from repair kit, Part No. 1H0 698 311 A.

Ensure that no brake fluid spills onto the contacts.

• ‒ → Release connector from control unit (arrow -1-) and unplug it (arrow -2-).

• ‒ → Remove bolts from bracket for hydraulic unit -1-.
• ‒ Carefully remove hydraulic unit with control unit.

Detaching control unit from hydraulic unit

• ‒ Unplug hydraulic pump motor connector from control unit.
• ‒ → Remove E 5 external Torx bolts -arrows- from control unit and remove control unit.

→ When detaching the control unit, ensure that the valve domes of the hydraulic unit are not misaligned by the control unit solenoids.

Cover control unit solenoids with a lint free cloth.

After separating the control unit from the hydraulic unit, use the transportation protection for the valve domes.

Installing

• ◆ Only remove sealing plugs on the new hydraulic unit when the relevant brake line is being fitted.
• ◆ If the sealing plugs are removed too early, brake fluid can escape, it can then no longer be guaranteed that the unit is sufficiently filled or adequately bled.

When attaching the control unit to the hydraulic unit, ensure that the valve domes of the hydraulic unit are not misaligned by the control unit solenoids.

• ‒ Attach the control unit to hydraulic unit using new bolts. Observe tightening torque, max 4 Nm.

Do not fully tighten bolts. Connection of the various brake lines to the hydraulic unit is facilitated thereby.

• ‒ The remaining installation steps are carried out in the reverse sequence.
• ‒ Bleed brake system
• ‒ Enter radio code.
• ‒ Encode the control unit.

=> Running Gear Self-diagnosis for ESP, Steering; Repair group 01; Performing self-diagnosis; Encoding control unit