Had the same problem, but alum rims were so hot could cook an egg on them, brought back to the (St)ealer and $800 later complete brake overhaul, calipers, rotors brakes. SA stayed pads jammed in calipers, cooking the rubber boots on the pistons and jamming the bakes on! Not covered under warranty, because brakes pads caused it????? Anyways not happy and calling Ford. TSB AS-21800 reference.