I noticed when my truck sits for a long time, like for a week, I notice the brakes seem to be locked up, only for an instant when I first pull out, and after I have the truck moving, its ok. I never use the parking brake when its parked, and I noticed the rotors are rusted, maybe its just the rust from the rotors causing it to hang up. 2003 F-150 4X4 Reg Cab, 4.2L, 5 speed