I have a 2000 super duty and i replaced both back rotors and pads about a year and 4 months ago. My rear left brake is fine, plenty of pad and rotor left but the rear right is ground down to almost nothing, and theres not a lot of the inside part of the rotor even left and i can feel it grinding now after pulling the trailer this weekend. Also a year ago i replaced the rear left caliper because one of the pistons were froze. Is the right caliper starting to do the same thing or could it possibly be the slide pins? Thanks for the help

 

My guess would be slide pins.

 

Agreed. Slide pins are froze up not allowing the brakes to release like it should.

 

... or the left rear slide pins are not allowing that brake to operate properly. I was taught that by my truck.

 

Turns out the slide pins were fine, caliper wasent. One new caliper and my brakes feel great