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I also remember an old TLCA discussion concerning a cruiser that had brake lock-up while towing. I think the problem turned out to be a missing return spring on the brake pedal. Just the subtle bouncing of the pedal/push rod against the MC plunger was causing the lock-up. A weak return spring might allow this to happen as well.
Assuming that everything is adjusted correctly... are you certain you're getting all the air out of the lines. You must bleed repeatedly to remove air that may be trapped a good distance from the bleed screw. Sorry if this is painfully obvious. Just trying to help you cover all the bases.
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