I started hearing a grinding sound in the rear when I applied the brakes so I bought pads to do a rear job. I noticed that the passenger side inside pad was worn to nothing and the inside rotor was scorched pretty bad. The outside was fine with plenty of pad - as were the pads on the drivers side.
What would cause only one pad to wear premature versus the others?? Also I started this job in the middle of the driveway and my wife had to go to the store. I moved the truck and applied the brakes with the pads out.

Can I get the piston back in without bleeding the system??
Thanks for your help!!