Had an Air Leak (behind dash)
 

on our trip to virginia last month i developed a small air leak...nothing serious...small leak behind the dash, and only when foot was on the brake pedal.

I got up to virginia i and did some searching around...was glad to find out it
wasnt a loose or split line.

turned out to be one of the switches in the manifold behind the dash...it was leaking around the aluminum crimp on the switch, and w/ a little searching i learned it was the Cruise Control Cut Out.

really had a tough time getting a socket behind the dash so i took my time and did it right...

https://www.truckconversion.net/attac...62b5df14e6.jpg

https://www.truckconversion.net/attac...b06c4a659e.jpg

worst part was the freightliner dealer couldnt find any manifold w/ 5 switches in it...nor could he tell me what any of the switched was for....too bad he didnt have google like i did....

https://www.truckconversion.net/attac...d2b455a5bc.jpg

Connector Numbers
 

Did you by chance remember or wrote down which pin number went with each switch?