I just got my truck out the paint shop and my brakes started acting up a little bit. They used to sqeal a little bit but they are making more noise now. My pads are almost a half inch thick so that isn't the problem. The truck started to pull to the left when I applied the brakes. Once when I was pulling out my driveway I put the truck in reverse and couldn't move because they were locked up. I freed it by going in forward sharply. Maybe the caliper is sticking closed, because sometimes when I just start to move I hear a slight squeel without the brakes applied. How do I correct this?