2001 Tahoe Rear Brake Pads removal instructions

I have a 2001 Chevy Tahoe thats in need of rear brake pads. Can someone tell me how to remove the calipers in order to get to the pads? As far as i can tell , there are two bolts that hold the caliper,however the bolts turn but won't screw out. What am i missing.Any suggestion?

there are four clips that your just slide off. One on each side of the brake pad. The bolts you unscrewed were probably the really important ones that you are never supposed to unscrew j/k. I had problems with my bolts when I unscrewed them so I hope you don't have the same problem.