Before beginning any work on the ABS system, note the following important points:
Before performing repairs on ABS system, determine cause of any malfunction via On Board Diagnostics (OBD).
Disconnect the negative battery cable with the ignition switched off before working on ABS system. Note radio code (for vehicles equipped with coded anti-theft radio).
Before carrying out welding work with an electric welding unit, follow all applicable safety precautions.
When working with brake fluid, observe relevant safety precautions and notes. Refer to Brake System Bleeding for more information.
After finishing any work that required opening the brake system, bleed the brake system using the bleeder filler and bleeder unit VAS 5234, or equivalent bleeding equipment.
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 anti-lock brake system. Do not 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 them to keep them from being damaged.
Carefully cover over opened components or seal, if repairs are not performed immediately.
Only use lint-free cloths.
Only unpack replacement parts immediately prior to installation.
Only use parts in their original packing.
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, the ABS 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 (approx. 2 hours).