I have a BRAND NEW set of R56 brakes that i got from a new car that wanted R56 JCW retrofit.
needless to say i have read the threads that state the R53 JCW brakes ARE the R56 brakes but i was wondering what modifications i may have to make if any in order to install these? I have everything calipers,brackets,pads,rotors,etc. i just was wondering how daunting of a task this is or is it just like doing a brake job with new parts? i havent had a chance to get everything together and compare.
a step by step would be amazing. thanks guys.

 

i did that 2 weeks ago (
the only thing you need are the brakes and a new set of brake lines.
the connection for the brake line on the r56 caliper is a little different from the r53 calipers, hence the new/different brake lines

pretty straigt forward
( at least the brake install... but while i was at it i figured i should increase the air flow to the brake... that was a bit more work then i originally imagined since i had to remove the wheel hub to install the air channel plate )

 

I have done it also, and it is very straight-foreward:remove & replace with a brake-line change. (Now is the time to order those lines, Stainless Steel Brakes makes them for the R57, which is what you want. Possibly others do also by now. Older web catalogs are still showing a single part number for all years, and you don't want that one.)

One caution: if you look around, you will find threads of woe from folks that let the lines drain and get air in them while working on the brakes. Get air into ABS/DSC system and you are likely looking at having it towed to the dealer .

So, before you take off the old lines, wedge length of wood between brake pedal and seat base. Holding the brake pedal down 1-2 inches is all that's required to block the port in the master cylinder, so that the metal lines don't drain and get significant air bubbles in the high-tech stuff during the change-over.

 

i also did it. click on the link in my sig. pages 2 and 3 should answer all your questions.