Check if its draggin' deez nutz.
No really, I'd take the brakes off and check everything. Make sure the caliper slider pins are greased up and stuff. I've had a caliper lock up too. You'll be able to tell if your car pulls to one side and or just 1 of the 2 pads are worn more than the other. Calipers can usually be rebuilt too. If all is good, put it back together.
It could also be the front wheel bearings maybe, but not likely.