As I had some free time after VERY long time last Sunday (father of 2year old twins so I decided to give it a go and finally swap the brakes. I've had all the parts lying around for some time now so had pretty much a solid idea of what I was going to need.. Some pictures prior to install: I've been weighting every single component so I can compare the weight of this conversion to the OEM brakes (lots of people say this is lighter then OEM) but although I still haven't weighted the OEM components, I'm willing to bet my next months salary (incl. Bonus) that's simply not true. Perhaps the BREMBO calipers are a bit lighter than OEM, but the ML55 rotors (Brembo) needed for this swap are just monstrously heavy. The AUDI OEM disc felt like a feather in my hand after holding the ML55... Anyways, will update you with detailed comparison in a short future hopefully. Here's what it used to look like with OEM brakes on RS4 19" wheel (sorry for the crappy pictures, will post some better ones in due course) Here's one during the install: and two more crappy ones ofter finishing the passenger side: As I run out of time, weather & light (short days) I only managed to finish the passenger side, so the other side will need to wait till I make some time again.. Just a few reflections on the install: The main thing that really surprised me was that the the ML55 AMG disc's retaining screw hole didn't line up with my AUDI's hub one (don't remember anyone mentioning this on the other forums I've read) so it was a pain to install as the wheel bolts wouldn't go all the way in to hold the disc tightly in place, hence I was also unable to use a DTI to measure the run-out of the disc.. So I'm going to attempt to drill one out using the old disc as a template... In terms of looks, the ML55 disc's hub is slightly larger then OEM. The RS4 alloy would run smoothly into the OEM disc before, now there is a small step where the alloy touches the disc (you can see this on the last picture above) and to me it's like a 2inch wart on Angelina Jolie's nose... However the biggest concern is that I actually cannot make my mind whether I really like the look of those Ferrari red calipers on my Audi or not. One moment I like it (probably 5year old within, another I feel like it looks as something out of a chav tuner magazine... Let me know what you guys think! The actual question I have is whether someone would happen to know how to route and where to attach the RS4 brake lines as they look a bit on a long side to me, but then, I only spend like a half a minute trying to work it out before I called it a day.... The following two pictures should show it clearly: I'd also like to say big Thanks to a member Alex (Ajax1976) for sharing his wisdom and experience which saved me lots of time and effort. Cheers mate!