You have spoken about the proportioning valve several times, you have mentioned residual valves once saying "maybe I need them in front".
Do you have them and where are they in the system? They are typically mounted right on the prop valve, a 10 lb for rear and 2 lb for front as has been said. You may only have one for rear. Be sure it's there in the correct port ,before the split, and is not backwards. It may have come pre mounted. You should have one front line with a split to left and right and one rear line with split to left and right. Is that what you have?
Ok David, you have three possibilities, not correct/missing parts, bad parts or you have it plumbed wrong. My suggestion: Instead of having everyone ask you "did you do this or did you do that" etc. (like I'm starting to do)
Why don't you tell us exactly how it's plumbed from MC on out. Explaining every fitting, valve and how lines are split...every detail. In doing this you may see the problem yourself or someone may catch it. I know it's a simple system and you know what you are doing but we have to start this way. We have all stared right at a problem and not seen it for days. Also include what is NOT new at front brakes and what is NOT new at rear brakes. Take off rear drums and inspect each rear brake assembly to see all parts present and installed correctly. Compare to a picture from a book or the web. Visually observe the front brake operation. Keep an open mind. Do not assume anything is correct. Look at it as if you are somebody else. Something bigish is wrong. If all pans out, maybe you have a bad part. If you decide to post the info, look at the whole system again before posting, don't guess it's right. This is the quickest way to get help from afar without a bunch of back and forth. You don't need the hose squeeze test anymore. It is not identifying anything. Can you see the fluid level in MC? or is it blind? Please examine every inch of the system for a fluid leak with a good light.
