[Mr_Rich]

This is a relevant thread since I also have a K2500 that I have do a four wheel rebuild on the braking system. I've already replaced the master cyl. and hydro-boost unit. So I'm following along on the drum rebuild.
I installed a rear disk conversion over ten, maybe fifteen years ago on my K1500. It was a Stillen kit with an internal drum emer. brake. I was fretting earlier this year because I wore down the rear pads to metal and was told by a rep at Stillen that they no longer have parts for this kit. It turns out I was in luck because the calipers used are the same ones on my '98 Firebird. I had an extra set of pads and I was able to get the rotors turned and be back in business. I never had complaints about braking on this truck with this kit. My truck stops smoothly and quickly in my experience.