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I had this same exact problem on my 88 when I got it. It had been sitting about 18 years. New rubber lines, rebuilt calipers. No change. Swapped the master cylinder and that fixed it. I looked at the old master and the equalization port was plugged up. Its a tiny port that allows the presure to bleed off when you release the pedal. In my case, the more you used the brake the tighter they got. I think I could have just cleaned it out and reused the master, as it wasnt leaking.
In reality, my problem was both flexible lines and the master from sitting too long. HTH
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