Proportioning Valve Keeps Tripping?

[Dashman]

I offered some advice early on and saw that you were getting better advice from others, but I've been following. I had suspected your rear rubber hose, and I couldn't find in your posts if you had replaced it. I'm glad you were able to troubleshoot your brake lines, and thank you for posting on your updates. You're helping some future 67-72 GM truck enthusiast that may have similar issues. The tee can be cleaned unless it's part of the rubber hose. I hope your brake kickass after all that you've had to do.