10" drum or Kelsey-Hayes

The master circuits are front and rear and should be the same pressure across both front brake lines as they are common. The calipers you disected are not supposed to be taken apart but getting the pistons unstuck is sometimes impossible without going that route. I took frozen ones apart and got them back together, what is the issue, fitment? I would attempt the disk, much easier to equalize than the drums and less fade.