okay, back from audi and this is the final say:needs vacuum check valve and jet pump valve and clamps. estimate $219.91 for the valves only. ABS control module $525.00 plus $330.00 labor"

anyone know anything about these parts? (except the ABS module) do you know how to fix it or to clean it or where it's even at on a 2000 A4 1.8T (fwd)? thanks for the help!

 

DOn't know wat Jet pump valve your talking about. The vacuum check valves are those gray and black valves around the motor. There probably corroded. Easy to replace.

 

i'm a visual person, do you know where i might find a pic of them?