how mujch should rear brakes cost on Audi A6

Will be little expensive. 500.00 or so.

If I tried to guess, it would be too low- Audis are VERY expensive, and need a LOT of repairs- and the labor will be expensive, too, because you need an Audi specialist to work on it- if you get a shade tree mechanic to work on it, it will not get done correctly, and you will wind up paying twice to get it done right- be careful