Notes For Repair Work on the ABS

Notes for repair work on the ABS

CAUTION:
^ The anti-lock brake system is basically maintenance free.
^ Testing, installation and repair work must always be carried out by properly trained technicians.
^ Non-compliance with the information in this repair manual may result in damage to the system and could make the vehicle unsafe to drive.

Notes:
^ Before carrying out repairs to the ABS, determine the cause of the malfunction using On Board Diagnostic (OBD).
^ Always check control module coding when installing a new hydraulic control unit.
^ Always switch ignition off before carrying out installation or repair work. If the vehicle is equipped with a coded radio, obtain the security code before disconnecting the ground strap from the battery.
^ See Caution before beginning repairs on the electrical system
^ When working with brake fluid, relevant safety precautions and notes.
^ After finishing any work that requires opening the brake hydraulic system, bleed the brake system (e.g. using VAS 5234).
^ During final road test, at least one ABS controlled braking operation must be performed (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.
^ Carefully cover over opened components or seals, if repairs are not carried out immediately (use sealing plugs from repair kit 1 H0 698 311 A).
^ Use lint-free cloths only!
^ 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.
^ When painting vehicle, electronic control unit 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).
^ Before carrying out welding work with an electric welder observe all relevant notes and safety precautions: