No brakes in the morning. It will definitely wake you up more than coffee.

[jamesd]

I think you are right . I also seem to remember such a part connected to the vacuum hose & plugging into a grommet built into the booster .

I did find this sensor on RockAuto.com , but have no idea if it is related to your problem ?

More Information for AIRTEX / WELLS 5S7870

Have you seen such a sensor ? If so , you might , VERY CAREFULLY , try unplugging the electrical connector & see what the results would be ? Be prepared to use the parking brake , if you try this .

Photos , please ?

God bless
Wyr

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.