either your left rear is frozen and is not engaging or your right rear slide pins are gumed up and the pads are draging (usually only one pad is worn, outside i think). is there more rust on the left rear rotor than the right??
that's what i was thinking(left side caliper problems).seems to be more rust on left side.but hard to tell due to the fact that on left side,theres rust on the inner/outer edge of the rotor and right side only has rust on inner edge(like in the pic).pins seem to be sliding ok too..
when i first got the car(1.5yrs ago) i checked the brakes out and of course i only checked one side(which was left,which seems to be about the same as it was then).
so tomorrow i'll be spending $19 for pads and possibly $40 for 2 rotors..
The right side is the side that gets driven through the gutters with all the salty snow/slush in it.
ain't that the truth..right side was always muddy..or clean(depending on what was on the side of the road(water or mud puddles)