AHHH!
OK, so I have / am experiencing the "something stuck between the brake dust shield and the brake disc"/"tin can rattling" symptom when backing up 3 times of the last 5 times I have backed out of the garage.
Don't hear it going forward.
I've tapped and shook and pushed back the dust shield but nothing has fall out yet. I'm away from home so I don't have my inspection tool or things to take the tire off with for a better hide-and-go-seek mission.
Any advise on places to look for it to be hanging in there?