Abs Repair Information

• Before carrying out repair work on the anti-lock braking system, as well as the control module coding, determine the cause of the malfunction using guided fault finding.

Perform "Guided Fault Finding" in Vehicle Diagnostic Tester.

• Disconnect the negative cable from the battery (GND) with the ignition off.
• Carry out before welding with an electric welding tool. Refer to => .
• When working with brake fluid, observe relevant safety precautions and notes. Refer to BRAKE SYSTEM, BLEEDING .
• After finishing any work that required opening the brake system, bleed the brake system using the brake filler/bleeder unit VAS 5234. Refer to BRAKE SYSTEM, BLEEDING .
• 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. Do not 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.
• After disconnecting the control module from the hydraulic unit, use the valve dome transport protection.
• Carefully cover over opened components or seal, if repairs are not performed immediately (use sealing plugs from repair set Repair Set 1H0 698 311 A).
• 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.
• When painting, electronic control module can be exposed to a maximum temperature of 95 °C (203 °F) only briefly, and to a maximum of 85 °C (185 °F) for longer periods (approximately 2 hours).
• Make sure that brake fluid does not enter harness connectors.