I am trying to get the brakes figured out on a 1985 60. New master Cylinder, new front calipers and pads, new rear pistons, shoes and hardware. Cannot get things to bleed, I believe it is the proportioning valve but do not know how to test it. I have seen somewhere about a test in the FSM but cannot find it or the thread I read it in. Do not want to buy a new one if its not needed. Ideas please? I know that I read somewhere "Do not open the proportioning valve" or some such BS but I'm a guy that opens everything so I know how it works. Exploded diagram would be great. I believe I saw one somewhere but cannot find it.