I thought I had seen something a while back about using silicone brake
fluid. However, searching the archives, I could find nothing. Is it ok
to use Silicone brake fluid in a 91 200 Q or will it damage the ABS?
>From what I understand, DO NOT USE DOT 5 (SILICONE) BRAKE FLUID IN AUDI ABS
BRAKE SYSTEMS!!!! (Sorry to shout but this is extremely important.) Dot 5
WILL damage critical seals within the system over time and you WILL be
replacing the master/slave cylinder, not to mention some extremely
high-dollar ABS component. ONLY use DOT 4 unless otherwise specified. Check
your owner's guide.