Here's everything that was under that cover. There's still a washer inside the housing. The thing on the right above the springs goes on top of the thing next to it. The arm mounts on the thing on the right. The thing on the left has the magnet that holds the brake pad on the other side of it.

As you can see, the mounting bracket is one piece. I was wrong about that.

I'm no mechanical engineer, but isn't that more complicated than it needs to be? Also, why does the mounting bracket that the screws go through have to be part of the arm mechanism?

Nothing is broken but there were a couple tiny pieces of metal, so maybe something is worn.

Can a caliper with mechanics this complicated be low end?