ABS Repair Information

ABS Repair Information

The anti-lock brake system is generally maintenance-free.

Testing, assembly, and repair work may only be performed by qualified personnel.

By not observing the points described in the repair manual, the system can be damaged and vehicle safety could be compromised.

• ABS Version Mark (MK) 25 is installed on this vehicle model.

Vehicles with ABS Mark 25 do not have a mechanical brake pressure regulator. A specially coordinated software program in the control module determines brake pressure allocation at the rear axle.

• Before performing repairs to the ABS, determine the cause of the malfunction via "Guided Fault Finding".

• Disconnect battery before working on ABS system.

• When working with brake fluid, observe relevant safety precautions and notes, => [ Brake System, Bleeding ] Service and Repair.

• After finishing any work that required opening the brake system, bleed the brake system using the bleeder and filler tool (VAS 5234). Refer to => [ Brake System, Bleeding ] Service and Repair.

• 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, 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.

• 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.