On my way home from work today I heard an odd rhythmic scraping from my rear passenger drum. I pulled the drum off and found a rock had worked its way into the lip at the edge of the drum. However, while I had it apart, I noticed the auto-adjuster had worked its way back to zero.
Now, correct me if I'm wrong, but aren't they only supposed to go in one direction? I wonder if I might not have something installed wrong. E.g. maybe I have the brakes mirrored. I realize this is the wheel I did a bearing on recently but it's possible I have some parts from the driver and passenger side flipped.
Best image I have. Right side is toward the front of the car:
