Procedures

Notes for repair work on ABS, ABS/EDL

WARNING! Brake fluid is poisonous.

Note:
^ Before working on the ABS system, determine the cause of the malfunction using On Board Diagnostic (OBD).
^ Before working on the ABS system, disconnect the battery ground (GND) strap. Obtain the radio code for vehicles with a coded radio.
^ Before doing any welding work with an electric welding unit, disconnect the ABS control module.
^ When working with brake fluid, observe the relevant safety precautions and notes.
^ If the brake hydraulic system had to be opened during the course of repair, bleed the brake system after completion of the repair.
^ During the final road test perform at least one controlled brake test where the brake pedal is felt to pulsate (ABS operation).
^ Absolute cleanliness is required when working on the ABS system. It is not permitted to use any products which contain mineral oil, greases, etc.
^ Thoroughly clean all connections and the adjacent areas before loosening. Do not use aggressive cleaning agents such as brake cleaner, gasoline, thinners or similar.
^ Place removed parts on a clean surface and cover them. Only use clean plastic covering or paper. Do not use rags that may contain lint.
^ After separating the control module from the hydraulic unit, use the transportation protection for the valve dome.
^ Carefully cover or seal open components if repairs cannot be carried out immediately. Use the sealing plugs contained in repair kit, Part No. 1 H0 693 311 A.
^ Do not use rags that may contain lint.
^ Only remove replacement parts from packaging immediately prior to installation.
^ Only use genuine packed parts.
^ When the system is open do not work with compressed air and do not move the vehicle.
^ Make sure that no brake fluid enters electrical connectors.