on my drive home when i pulled up to lights smoke(or steam) came from the passenger side rear brakes, when i looked everything was really hot including the rim, not long had the brakes done so cant be metal on metal or anything....any idea what this could be? does the handbrake control the rear brakes? could this be stuck on slightly?. also on further inspection both rear calipers look as if they are sitting in different positions, what could cause this? see pics

this one that doesnt look right

this is the one that looks ok but had the smoke and burning smell coming from it
cheers
Scott