Procedures

Anti-lock Brake System Repair Information

• Before performing repairs to the Anti-lock Brake System (ABS), determine the cause of the malfunction via "Guided Fault Finding".

"Guided Fault Finding" is performed using the vehicle diagnosis, testing and information system (VAS 5051).

• Before working on the ABS, disconnect the battery ground (GND) cable. Note radio code (for vehicles equipped with coded anti theft radio), determine if necessary.

• Carry out before welding with an electric welding tool.

• When working with brake fluid, observe relevant safety precautions and notes. Refer to --> [ Brake System Bleeding General Information ] Brake System Bleeding General Information.

• After finishing any work that required opening the brake system, bleed the brake system using the brake charger/bleeder unit (VAS 5234) or (VAG 1869). Refer to --> [ Brake System Bleeding General Information ] Brake System Bleeding General Information.

• During final road test, carry out at least one ABS controlled braking operation (appropriate pulsations must be felt at brake pedal).

• Absolute cleanliness is required when working on the ABS, 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 plugs (1 H0 698 311 A))

• Only use lint free cloths.

• Only unpack replacement parts immediately prior to installation.

• Only use parts in their original packaging.

• Do not work with compressed air and do not move vehicle while the system is open.

• Make sure that brake fluid does not enter harness connectors.

• 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).