E450 Rear Brake Pad Replacement - long post w/pics

Trying to remember what I was working on recently, but a brake bleeder or two was plugged with rust. They can be cleaned out, or replaced. If something you're trying to do just doesn't seem to be progressing, take the bleeder all the way out and check it. The hole you can see from the outside may be OK, but the holes that feed it might be blocked.