This problem is now fixed and the front brakes are releasing correctly. I fixed it by the taking the guts out of 01310A - Valve Assembly Pressure Control. This is the forth or fifth of these valves that I have done such to. This one was different because it is the only one I have worked on where the piston was not frozen and it actually moved. The piston in all of the other valves were rusted solidly in place. Once gutted the valve functions as an ordinary tee for front brake lines.
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