you have a bad master. i had the same problem, drove me nuts and also to excessive consumption of adult beverages.
also, don't think that just because the m/c just got rebuilt it cannot be bad, mine was rebuilt and it was bad right out of the box!!
to test, try removing the m/c, put it in a vise, cap all the line ports and depress the plunger (?) with a clamp, it should lock up and then slowly loosen if the seal is bad.
nazgul
nazgul
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