ABS Repair Information

ABS Repair Information

• First determine the cause of the damage and then get the coding from the ABS control module (J104) using the Vehicle Diagnosis, Testing and Information System (VAS 5051) before performing any service work on the anti-lock braking system.

• Turn off the ignition and disconnect the battery ground cable.

• Carry out before welding with an electric welding tool.

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

• After finishing any work that required opening the brake system, bleed the brake system using the Brake filling and bleeding equipment (VAS5234).

• During final road test, carry out at least one ABS-controlled braking operation (appropriate pulsations must be felt at brake pedal).

• It is necessary to maintain a high level of cleanliness when working on the ABS system.

• Do not use any products containing 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.

• Use the valve body transportation protection after disconnecting it from the ABS control module (J104) and the ABS hydraulic unit (N55).

• Carefully cover or seal any open components if the repairs cannot be performed immediately (use plugs (1H0 698 311 A) ).

• Only use lint-free cloths.

• Only unpack replacement parts immediately prior to installation.

• Only use parts in their original packaging.

• When the system is open do not work with compressed air or do not move the vehicle.

• The ABS control module may be briefly exposed to a maximum temperature of 95° C when painting.

• The ABS control module may be exposed to a temperature of 85° C for approximately 2 hours.

• Make sure that brake fluid does not enter harness connectors.