Removed excess material on the other side.

The image shows the clearance on the top leg of the brake caliper

As I said before, the drawing C2 is kind of a mystery on how parts go together. I made this close up shot of the left (pilot) side brake system.

The inner plate of the brake caliper goes on the left side of the U-403. Then you add the spacers on the right side and the U-810 on the inside.
The other side of the brake caliper slides on the inner plate.