My rear (esp. Left Side) brake makes noise as if it's dragging, especially noticeable at 15 mph with clutch depressed (less engine noise). The inside rotor is rough and wonder if its a sticky caliper and if there is an inexpensive or easy fix?? I'm using EBC Red Stuff pads and EBC slotted rotors. See Photo.
It also might have simply come off of the clips on the piston, but that wear pattern is definitely something you want to check out.
We didn't have time, etc, to take things apart and investigate properly. For those who can't tell, that's the hub side of a rotor still mounted to the hub...made it a bit of a challenge to get a good pic.
It looks like only half the pad is making contact with the inner rotor surface, I bet you lost half you pad from the looks of it! Don't wait have it checked out, nows the time to investigate! That rubbing sound could be a small piece of the pad broken up scraping the rotor.