Typical. The pins that the calipers slide on need to be disassembled along with the boots they slide through. Clean everything up and lube with either Sil-Glyd (or some weird spelling like that - NAPA) or Amsoil water resistant grease. Make sure whenever you do a brake job that this is done. When you reassemble, you should be able to bolt the caliper in place with no pads (Finger tight is OK) and slide it side to side with your hands. If not, something needs cleaning/lubing.