where does this vacuum line go?

[Kk4yvx]

06 expy, 53000 miles, ex k-9
I bought this truck recently and I have been cleaning it.
Does anyone know where this vacuum line goes?

 

[Skauber]

I think that's the vent line for the front hubs for the 4wd, if you have that. If your truck is a 2wd, then it's something else

 

[Kk4yvx]

Thank you Skauber.
I do have the 4wd.
So if it's a vent line for the front hubs it's normal that it just hangs there not attached to anything, right?

 

[Skauber]

Yes, the vent line should be open. See if you can trace it down to the wheel. If you look into the fender on that side, you can see two vacuum hoses. One is supply, the other is the vent to atmosphere.

 

[Kk4yvx]

Thanx again.
Will do.