Re: Brakes locking
First thing I would do is check the free play of the pedal to the booster, it only needs about 2-3 mm. Adjust accordingly. Free play is needed for preventing the valve from staying open allowing engine vacuum coming in and applying the brakes ever so slightly.
Since you changed the master cylinder and not the booster, you should do as previously suggested, loosen the master cylinder mounting nuts allowing the master cylinder piston to retract reducing the line pressure you found previously.
If loosening the master cylinder reduces line pressure, the next step would be to remove the master cylinder from the studs, brake lines can remain attached, and measure the depth of the piston hole from the mounting surface and compare the length of rod sticking out from the wall. If rod is too long, cut some off and match the same contour as original end. Install the master cylinder.
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