Thanks all for the advice.
I have been working on these brakes, off and on, for three summers.
Finally last summer we sent the airpac out and paid over $300 to have it rebuilt. Since then I have had these "locking up" and "dragging" problems.
I have rebuilt or replaced all 12 brake wheel cylinders. Have bled and adjusted them many times. Have tried to determine if it is any of the rubber lines.
For awhile I had the brakes adjusted completley back, as loose as possible. That was I was able to get around with it in a couple local parades. But it was still dragging, and a couple times locked tite. This is too hard on the truck. Besides, I want it right.
This is my Fathers project and we spent many many happy hours, and many hours arguing over things, as we toiled away on it.
Now he is in tough shape and its the only thing he really seems interested in, so I cant just get rid of it. For me, it is just tooo hard and tooo heavy for my taste, though it sure is a neat old truck when it's working.
If we never do anything else with it just the time I have spent with my Dad as we worked on it was great,
But it is not he and I anymore. He cant do a thing, sometimes cant even stay out with me while I work on it. So that part of the fun is gone.
I have suggested to him we sell it while it is still in great condition, but he will not hear of it. He and Mom could use the money to help pay the help we now have to hire to help with him and her. But he just isnt quite right since his (our) stroke.
I will go thry the TM as best I can, but I am not a real mechanic and I do not understand everything. Just wish there was someone around here that could come look at it and at least tell me what to do, though I'd rather just be able to pay someone and "Git Er Done".
Thanks again friends and please forgive my ramblings. Sometimes it can get a little emotional around here!
Brad