I have an 08 expy. Since I bought the truck 30k miles ago, I have had what I thought was a warped rotor. While replacing the lateral links yesterday, I decided to lube the brakes. There were no clips for the pads to ride the caliper. Therefore, the pads were rusted to the caliper bracket. These things barely moved when I stepped on the brakes, now I understood the peddle drop. Anyhow, the book says to "grease the pad" were it slides on the caliper bracket. How stupid to not just use a ******** clip. anyways, The pad was plenty thick, because it wasnt moving. so it never was caught in safety inspections. Pull them off and check it out. doubt you need a new caliper, as the guide pin design is top notch.