Quote:

..sounds like there could be a residual pressure valve in the master.
just a thought.



Agree... as suggested above next diagnostic is to crack a bleeder and see if that releases some of the drag. If so there is a residual pressure valve in the master or in the distribution block or one of the above is malfunctioning.

Also, there is a possibility the flex hoses are collapsed inside... they will expand to apply brakes but close up afterwards and retain pressure. I had this on a DD Neon and changed hoses based on a tip from MOPARTs. It cleared right up. The hoses were old.