If the master cylinder does not return after pushing on the brake and is all connected up and blead as well as possible you could try pushing the brake and while it is trying to return (might take two people- one with a spanner one pressing the brake) crack open the hydraulic fitting on the outlet of the master cylinder. If it snaps back that would suggest a pipe blockage - usually a flex hose with no hole up the middle because the rubber has swelled. Enough pressure when pressing the pedal but not enough from the return springs. Also crushed metal pipes do happen.
David
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