So, I have a 3.2 V6 Cab Quattro. It's hard to work out looking at all of these sites that tell you to enter your reg so you know what you need. Then it presents me with about 4 different brake disc sizes. It looks like it might be 345mm's however if I'm wrong then they won't fit on the carrier or potentially behind the wheel though they're 18's so there should be room (Never had the wheels of my car!) am I wrong or not? Any help is much appreciated. Either way my brakes are terrible, really do not slow me down any where near as quick as I was expecting, my friend has an A4 Avant 2.0TDI and he says the same thing about his. I've got almost 200KG's more weight though so I don't know. I'd expect them to be better.