Ok to start off, the truck is a 2003 F350 DRW 6.0L 4X4. So i knew i needed to do rear brakes but i had time. on friday coming down a decent hill, i started to brake and the whole *** end of the truck started to hop. i was concerned pulled off to investigate and saw and smelled nothing so i figured since it was hot out and the road was just paved that it had some ripples in it. Then sunday i heard a grinding noise. Monday i ripped the calipers off to see what was going on and my drivers side outer pad had 1/4 left, inside was metal to metal and the inner rotor was scuffed but not terrible. passenger side inner and outer both had 1/4 left on them. Since no one had rotors for my truck i got a cheap set of pads to throw on to get by for now. My question is now driving it for 2 days, it stops good but every once and awhile it feels like something is shifting in the *** end. Maybe its just me but it dont feel right. Caliper bolts are tight. Only difference i made were new pads and i had 60 psi in rear tires and i bumped them up to 70 psi..... i was thinking of dropping it back down to 60 psi. Also when backing into my driveway real slow, when i hit the brakes not too hard but not to soft either, the *** end of the truck bounced up and down one time. I maybe just paranoid that with running the pad metal to metal that it aint the same like it was if that makes any sense?
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Since you had one pad worn to nothing your driver side caliper pins are most likely the culprit. Pull it apart and lube them or replace the pins if necessary.

 

i pulled them out, they looked straight and had lube on them. i also lubed them up again and the caliper was a little stiff retracting it but it moved.