I am replacing all brake components on my 69 el Camino. Booster, m cyl,hold off valve,flex and soft lines, calipers and wheel cylinders. I know many folks have a difficult time when bleeding new systems. I am trying to avoid that. This distribution block?combo valve is the only thing I am reusing and wonder if it presents a bleeding issue? It does not appear to be a proportioning valve that slides back and forth( I have a tool to use for that) but rather a piston of sorts that goes up and down, Anyone offer and insight as to bleeding brakes with it in the mix?