One more for the classic Mustang experts. I just found out this unplugged connector in
the far right side corner of the engine bay. I would not like to reconnect it before knowing
what is it for. Any clues? Thanks everybody.
The image you provided is of a Proportioning Valve. The connector is to your BRAKE light in the dash.
Search Ford Mustang Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Ford Mustang Experts