Inspected fluid in surge brake reservior since have been having a few situations where the backup solenoid didn't seem to be working. Found it almost empty and full of water/rust! Amazing the brakes even worked! Seems the is a pretty typical issue with UFP a-60 brake actuators. Considering just replacing the entire m/c sliding unit now as potential replacement parts could be as much as a whole new sliding assembly.
Guess what I'll be posting next weekend in the "what did you do to your boat today?" thread