With Generic Scan Tool

General information on the Anti-lock Brake System (ABS)
Information for repair work on ABS

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 this system.
- Failure to observe the instructions presented in this may result in damage to the system and to loss of vehicle safety.

CAUTION:
- Brake fluid must never be brought into contact with liquids containing mineral oils (e.g. oil, fuel, cleaning agents). Mineral oils damage the plugs and seals in the brake system.
- Brake fluid must not be allowed to come into contact with paint work because of its caustic effect.
- Brake fluid is hygroscopic (i.e. it 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 (approx. 2 hours).
- Before carrying out work using electric welding equipment, refer to safety precautions.
- 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 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 1140698311A). Part numbers are listed here for reference only. Always check with your Parts department for the latest information.
- Do not use fluffy cloths.
- Only remove replacement parts from packaging immediately prior to installation.
- When the system is open do not work with compressed air and do not move the vehicle.
- Before carrying out repairs to the ABS, determine the cause of the malfunction using On Board Diagnostic (OBD).
Refer to, ABS/EDL/ASR On Board Diagnostic (OBD)
- Always check the control module coding when installing a new hydraulic control unit.
Refer to, ABS/EDL/ASR On Board Diagnostic (OBD)
- Always switch the ignition off and disconnect the battery Ground (GND) strap before carrying out installation or repair work.

CAUTION: 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 Refer to Brake hydraulic system, bleeding and changing brake fluid. In addition, carry out a high and low-pressure test of the brake system Refer to High- and low-pressure test.
- 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).
Refer to, ABS/EDL/ASR On Board Diagnostic (OBD)