ABS Repair Information

ABS Repair Information

ABS Mark 60

The anti-lock brake system is generally maintenance-free.

Testing, assembly, and repair work may only be performed by qualified personnel.

By not observing the points described in the repair manual, the system can be damaged and vehicle safety could be compromised.

• ABS malfunctions have no effect on the brake system. However, a change in braking behavior should be checked.

Vehicles with ABS Mark 60 do not have a mechanical brake pressure regulator. A specially coordinated software program in the control module determines brake pressure allocation at the rear axle.

• Before performing repair work on the anti-lock brake system, determine the cause of the malfunction using On-Board Diagnostics (OBD).

• The connector at the hydraulic control unit may only be disconnected if the ignition is switched off.

• When installing a new hydraulic control unit, it must be coded Vehicle diagnosis, testing and information system (VAS 5051).

• Bleed brake system after opening. Refer to => [ Brake System Bleeding ] Brake System Bleeding. To do this, use the Brake Charger/Bleeder Unit (V.A.G 1869) or Brake Charger/Bleeder Unit (VAS 5234).

• Absolute cleanliness is required when working on the anti-lock brake system, it is not permitted to use any products which contain mineral oil, such as oils, greases etc.

• Thoroughly clean all unions and the adjacent areas before loosening. Do not use aggressive cleaning agents such as brake cleaner, fuel, thinners or similar chemicals.

• Place parts that have been removed on a clean surface and cover.

• Carefully cover over opened components or seal, if repairs are not carried out immediately. Use sealing plugs from repair kit. Part No., refer to the Electronic Parts Catalog (ETKA).

• When the brake system is open, do not work with compressed air and do not move the vehicle.

• Only use lint-free cloths.

• Only use genuine parts in their original packaging.

• Only unpack replacement parts immediately prior to installation.

• During the final road test, ensure that a ABS-controlled brake test is performed at least once (pulsation must be felt at the brake pedal).

• When painting, electronic control module can be exposed to a maximum temperature of. 95 °C only briefly, and to a maximum of 85 °C for longer periods (approximately 2 hours).

• Before welding operations using an electric welding device. Refer to General Notes, Body Repair; Safety Notes.