One problem related to air brake abs warning light has been reported for the 1999 Audi A4. The most recently reported issues are listed below.
Abs module failed approx may 2004 at 65000 miles. Abs not functioning and warning light remained lit on dashboard display. Replaced part with used abs module from another Audi A4. Old (failed) part is available.
| Air Brake Antilock Control Unit/module problems | |
| Air Brake Abs Warning Light problems |