Finished up this same project today and thought it might be helpful to share some of my experience so I can ease some future frustration for the next person. First let me thank the OP (toothofwar) for this writeup, when I googled the swap you're pretty much of the only resource available. I'll list out the following issues/notes and how I resolved them.
1. For whatever reason, using the same part numbers as the OP and all parts listed, I had contact between the caliper mounting tab and the back of the rotor, particularly under stress (cornering). I has to mill 0.060" off the inside of the caliper mount tab. Clearance was gained at 0.040" but to be safe we removed another 0.020". I probably could have spaced the rotor out however I had no access to 2-3mm spacers but we had access to a mill
. Milling is probably a better long term solution anyhow. If you mill, do so on the inside of the caliper mount tab, not the outside as you may affect the integrity of the threaded nutsert's shoulder which could compromise the entire system.
2. Check your heat shields, even though my brakes had never been tampered with, passenger side heat shield was contacting the rotor. Removed rotor, massaged a bit with a hammer.
3. I requested 26" brake lines (in case I return my Alltrack to stock suspension) but Technifit sent me a pre-labeled "Audi A3 Kit" with 24" lines, I was disappointed but installed them anyway. Then during the install, both rubber bushings slipped out of the piece that attaches them to the knuckle. In order to re-fit them, I had to trim a shoulder of the bushing with a razor knife and spent probably a collective hour of massaging to get them even close to how they originally fit then super glued the bushing into the knuckle attachment piece. In hindsight, if you need to slide/adjust the knuckle-attachment bushing, do so gently and maybe use a lubricant of some sort.
4. Test fit factory Alltrack 17x7 wheels, plenty of barrel clearance but will require a spacer to fit. 8mm wasn't enough clearance but 15mm gives plenty of room. Wonder if 10-12mm would work (I didn't have these sizes). 18x8 Audi Sewer Caps are a similar story, 8mm made contact, currently running 15mm but will order up a smaller size at some point.
