Goodness I love this forum, you really can find everything.
Quote from this thread:
Pretty sure that is what happened.
I measured what I did and found that I was sticking 13mm past the flange of the aluminum spacer at first, that caused the pre-load on the master and the exact symptom of the brakes coming on and staying on. Then on the side of the freeway I moved it down to 6mm past the flange and the car drove back with no problems. I have it currently set to 9mm which is in spec, but I will be checking for preload and complete release to make sure I don't run into problems again.