Antilock Brakes / Traction Control Systems: Service Precautions

WARNING: Brake fluid is poisonous.

- It must NEVER be removed by siphoning with your mouth.
- If brake fluid contacts skin or eyes, flush or wash adequately to prevent irritation. Get medical attention immediately if necessary.
- Brake fluid must be disposed of properly in compliance with environmental regulations.

CAUTION:
- The anti-lock brake system is basically maintenance free.
- Specialist knowledge is required for performing any work on ibis system.
- Failure to observe the instructions presented in this Repair information may result in damage to the system and to loss of vehicle safety.

- Brake fluid must never be brought into contact with liquids containing mineral oils (e.g. oil, heel, cleaning agents). Mineral oils damage the pings and seals in the brake system.
- Brake fluid must not be allowed to come into contact with paint work because of its effect.
- Brake fluid is hydroscopic (i.e. if absorbs moisture from the surrounding air) and should therefore always be stored in airtight containers.
- Always dispose of used brake fluid properly.
- Make sure that brake fluid does not enter the electrical harness connectors.
- During painting operations, the electronic control module can be exposed to a max. temperature of 95°C (203°F) for only a short period, and to a maximum of 85°C (186°F) for longer periods (approximately 2 hours).
- Before out work using electric welding equipment, refer to the appropriate safety precautions.
- Thoroughly clean all unions and file adjacent areas before loosening. Do not use aggressive cleaning agents such as brake cleaner, fuel, thinners or similar chemicals.
- Place removed components on a clean surface and cover.

- Carefully cover or seal open parts if repairs cannot be carried out immediately (use sealing plugs from repair kit 1H0 698 311 A). Part numbers are listed here for reference only. Always check with your Parts supplier for the latest information.
- Do not fluffy cloths.
- Only remove replacement parts from packaging immediately prior to installation.
- When file system is open do not war* with compressed air and do not move file vehicle.
- Before carrying out repairs to the ABS, determine the cause of the malfunction using On Board Diagnostic (OBD).
- Always check the control module coding when installing a new hydraulic control unit.
- Always switch the ignition off and disconnect the battery Ground (GND) strap before carrying out installation or repair work.

- Before disconnecting the battery, determine the correct coding for the anti-theft radio.

- After finishing any work that requires opening the brake hydraulic system, bleed the brake system. In addition, carry out a high and low-pressure test of the brake system.
- Use only packaged genuine Audi replacement parts.
- During the final road test, at least one ABS controlled braking operation must be performed (normal pulsations must be felt at the brake pedal).