Notes for repair work on ABS, ABS/EDL

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

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. Refer to Brake system, bleeding .
If the brake hydraulic system had to be opened during the course of repair, bleed the brake system after completion of the repair. Refer to Brake system, bleeding .

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.