56,
Just a ? ..did you replace the rubber flex line at the rear with a new one ?
Just asking because when I redid my system my flex line looked great on the outside no dry cracks or nothing so I reused it but internally it was shot and caused me MANY HRS. of frustration when I tried to bleed the system, internally it had rotted and plugged up and would not let me get any pressure, after replacing it the Rear brakes darn near gravity bled themself.
Tim