Quote Originally Posted by jamesd View Post
It does have that sensor. That is the brake fluid level sensor. It connects to outside of the master cylinder under neath reservoir. I know this because I just learned about it last week lol.. It came inside the box with the master cylinder. On the bottom picture you can see the paint blistering on the booster just below the master cylinder bolt.
Well , if it is a brake fluid sensor , I doubt it has anything to do with the problem you are having now .

God bless
Wyr