Help .. Brake discs

[matt.russell]

What size would my brake discs be ?

I have a 2.0tdi SLine a4 2009 143hp the guy I'm ordering the discs off asked
me for the size of the discs and I don't have time to measure??? Any help then I will love you forever

 

[matt.russell]

314mm or 320mm ?

 

[Liquidfusion-S3]

Not sure what your one are but mine is this from the sticker code, and when checked on eurocarparts:

1KW BAH Disc brakes, rear <<<<<<< 1KW = 300mm
1LT BAV Disc brakes, front <<<<<<< 1LT = 314mm