It is probably the pins. They are made for the caliper to move back and forth on and can get gummed up or bent. More than likely they just need cleaning and greasing.
Get some brake cleaner and some paper towel type shop towels and some high temp axle grease.
Clean the pins and the holes they travel in completely. Inspect for large bends then put a little grease on the o rings if applicable. See if the caliper will slide freely on the pins. If so, grease them up a little more, make sure they bottom out because too much grease will keep them from going all the way in.
Make sure dirt boots are in place and don't have tears. Check for movement againa and then install.
Test drive and check for operation.
Tuesday, June 5th, 2012 AT 4:16 PM