To be able to determine the size of the brakes I need a 'front brake' code. You should find this either on the sticker on the inside cover of the service book or in the boot under the cover.
The code will be one of the following: 1ZD,1ZE,1ZF,1ZP,1LJ or 1LK.
Unfortunately the software I have cannot get the information via the internet from the Audi central system using the VIN number - only a dealer can do that.
Also you should be able to find the engine and gearbox numbers from the same sticker. The first 3 letters on the 5th row should be the engine type code, probably BKD or AZV and the last 3 letters on the same row should tell you the gearbox code. This should be either G** or H** J** or K**.
If you can provide any of this information I can tell you exactly which brake discs and the size fitted to your car.