Notes for repair work on ABS, ABS/EDL

WARNING: This page is about a different variant/trim than selected.

Before carrying out repair work on the anti-locking system, determine the cause of the malfunction using On Board Diagnostic (OBD).

Before working on the ABS, ABS/EDL system, disconnect the battery Ground (GND) strap. Obtain the radio code for vehicles with a coded radio.
Before doing welding work with an electric welding unit, disconnect the ABS control module.
When working with brake fluid, observe the relevant safety precautions and notes. Refer to Bleeding brake system with brake filler and bleeder unit VAS 5234, vehicles with ABS Mark 60 .
If the brake hydraulic system had to be opened, bleed the brake system with brake filler and bleeding unit VAS 5234. Refer to Bleeding brake system with brake filler and bleeder unit VAS 5234, vehicles with ABS Mark 60 .

During the final road test, make sure that a controlled brake test is performed at least once (pulsations must be felt at the brake pedal).
Absolute cleanliness is required when working on the anti-locking brake system. It is not permitted to use any products which contain mineral oil, such as oils, greases etc.
Thoroughly clean all connections and the adjacent areas before loosening. Do not use cleaning agents such as brake cleaner, gasoline, thinners or similar.
Place removed parts on a clean surface and cover.

After separating the control module/hydraulic unit use the transportation protection for the valve dome.
Carefully cover or seal open components if repairs cannot be carried out immediately. (Use sealing plugs repair kit 1 H0 693 311 A).
Do not use fluffy cloths.
Only remove replacement parts from packaging 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 plug connectors.