No, the 05+ 13" brake rotor and caliper upgrade requires 17" wheels. I picked up calipers and brackets from my local pick-a-part for $50. I would recommend new brake pads and rotors (you don't want to re-use old pads and rotors).
I am surprised that no one has mentioned hydroboost conversion. That made an enormous difference in mine. Way more than going to Powerslot stock-sized rotors. I did the 05+ caliper swap with 13" Powerslot rotors and Hawk HPS pads at the same time.
My advice: Do hydroboost first. Cheap and relatively easy. I got the parts for mine for $80 at a pick-a-part. Takes an afternoon. If that doesn't get you where you need to be, then go bigger brakes, but I guarantee that you will wish you had done this sooner.
---------- Post added at 04:33 PM ---------- Previous post was at 04:28 PM ----------
Link to hydroboost swap information (these are the instructions I used):
http://www.gmfullsize.com/forum/showthread.php?t=156800
Adjustable pedals are a bit more difficult and you need a pedal that came from an Escalade or some other vehicle that had adjustable pedals and hydroboost.