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I think chaseincats has it right. I saw this many many years ago on another z. Difference in length of the master cylinder and actuation rod. You may need to compare the lengths of old and new rods and adjust accordingly. Seal inside master cylinder doesn’t get back to where is should be and then acts like a check valve and does’t suck fluid back into cylinder. Then the pressure bleeds off through the seals just enough to let the system ‘relax’.
I think we ended up using like the old rod on the new master or something similar. It also was a Tokico to Nabco swap or vice versa.
 
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