Leaking coming behind dash when I pop in parking valve yellow valve

Looks like the pressure switch/sensor is leaking to me. If it's just leaking around the threads, snugging it up could work. Just don't strip it if you don't have a spare lol. I'd take it off, check threads and apply thread sealer myself.

 

It leaks around the base. You have to replace it. In my truck it's for the cruise control, 379. Same place, behind the dash. I have replace 3 in 10 years.

 

If it's the cruise control switch, I think you can bypass it. Undo the air line and plug it. But remember that the cruise control if it's on, it won't come disengage automatically when you hit the brakes. Or maybe it the cruise control won't work at all. Don't know, but I heard you can bypass it. I just replace mine everytime it goes bad.

 

CK. for a crack in the part that switch screws into, if you cant buy a new one look in truck junk yards for a used one?

 

You just dont get it..... it's junk buddy. Replace it. You can't fix it. I thought like you, I thought it could be fix, once you take it apart, you will understand. Buy two of them, you will be replacing another sooner than you think.

 

I forgot to mentioned, it's a dealer item only. At least for my 379 it was.

 

It's a bendix made valve, no reason to be dealer only.

 

What's the part number ? I will check it out.