mrrilla,

when you say that the calipers "do not retract" do you mean that the brakes are locked up OR do you mean that the pads drag on the rotors? Disc brakes are designed to NOT retract enough to create a large gap between the pad and rotor....if the calipers retracted the pads that much, when you put the brakes on the next time you would have a LOT of pedal travel....hmmmm