My rotor is wearing down one a portion of it; mostly the upper 50%. The car also is starting to pulsate a bit when breaking like warped rotors. Also, my e-brake only grips half of the rear. I finally figured out why: Pulled my rear wheels off to find the passenger rear brake caliper e brake mechanism seized up (not engaged). Also, the outside brake pad was about 1mm away from the rotor. I'm guessing the caliper is gone and I need a new one?