[rpmerf]

When you replace the caliper, make sure you take that guide pin out and grease it up really good.

Story time:
About 5 years ago, I put all new front brakes on my suburban - master, lines, flex hoses, calipers, rotors. The other day I'm driving home and the brakes are grinding when I hit them hard. Take a look and the inner pad on both sides are worn to metal, and the outters still have half a pad. I put less than 10K on this truck since everything was new, and now I'm buying another set of pads and rotors. Moral of the story: even if the calipers are new, take the pins out and grease them up really good.