Hi Dmitry,
Nobody has replied to you yet so I feel challenged. Take your Audi to a good mechanic. You don't give us too much information about the car and it's behaviour so I can only assume that it is a V8 with a really rough braking system. The brakes in the Audi V8 are probably the most complicated
part of the beast (front ones) along with the transmission and the cooling system, second to one Porsche model according to my mechanic. Please tell us if the ABS system bothers you in the long St. Petersburg winters! That's rough!
All the best,
Florin