You might have better luck getting an answer if you get the moderator of this forum to move your thread to the 4.6 "1996-2004" forum,since this is the "1979-1995" forum.Since you're already here though,did you try spinning the rotor without the caliper installed?? Maybe its not the caliper sticking thats causing the binding and subsequent heat.I would remove the wheel and caliper, reinstall a couple lug nuts to hold the rotor in place then try spinning the rotor to see if it spins freely or not.If it doesn't,the bearing hub assembly is the source of the binding and subsequent heat and will need to be replaced.If it does spin freely,you could have got a defective caliper,if its a remanufactured unit.However,I have read numerous threads related to your symptoms that stated a couple possible causes.One- installing the pads on the wrong side,Two- a internally damaged brake line.From age and/
or prior brake work where the owner twisted
or kinked the brake line or allowed the caliper to hang by the brake line instead of using a ziptie or wire to hang it.This couldve damaged the line internally,which couldn't be seen from the outside.When it occurs,there is plenty of fluid pressure through the line (when the brake pedal is down) to make it past the damaged section of the line,but when the pedal is released,the pressure isnt high enough to make it back through the damaged section,so this keeps the caliper pistons from releasing properly and the brakes drag or lock up completely.One test that was mentioned was to jack the front of the car up,so that both wheels are off the ground,spin both wheels to make sure they spin freely,then press the brake pedal a few times,release then try spinning both wheels again.If the wheel you're not having trouble with spins freely,but the trouble wheel is locked up or dragging,wait awhile then check the wheel again and see if it spins freely again.If it is spinning now,thats usually an indication the line may be damaged internally,because over time the pressure/
fluid will gradually work its way past the damaged section of line and back towards the master cylinder and the caliper pistons will compress back into their normal position,releasing the pads from the rotor.If your test shows the results above,replace the brake line,preferably with a stainless replacement that youll never have to worry about again.
91 LX 342ci (10.5:1)
TFS 190cc (stage ll)
GT40 (tubular) intake
Weld ProStar XP's