its not the parking brake lever switch that was my first thought it has no effect when unplugged the switch on the proportion valve is the culprit, I really don't see the master being at fault either as the brakes work just fine, my thought is that the contaminated brake fluid has jammed the switch, I was wondering if it was like a reverse lamp switch that has a dent ball on it that may be jammed?, I will try to remove it later and see if it can be cleaned
