My memory of auto park is that it's a subsystem not having much to do with anything else on the rig. When you go to park there is a cam operated switch way up above the front wheel (and outside) that takes away power which had been maintaining hydraulic pressure to keep that spring loaded brake shoes off the drum. That cam operated switch controls a solenoid and does not carry high current. So I'm not quiet sure how auto park has anything to do with your problem - but then I'm working completely from memory right now. I'll have to dig into it a bit.