Vacuum Hose?

[Tick]

Just put brakes on my wife's 2004 Expedition and noticed what I think is a vacuum line clipped to one of the brake lines below the master cylinder. It is not plugged and I can not find any fitting it would have been connected to. At first I was thinking it may be a vent line, but I think it is way to small - inside diameter is about the size of a small finish nail (approx. 1/16"). So, my questions are: (1) is this a vacuum line? (2) if so, what for and where should it go or should it just be plugged?
Thanks,
Tick

 

[ELVATO]

Could you take a picture of it?

 

[Tick]

I'll take a picture of it tomorrow.

 

[Tick]

Vacuum ???? hose photographs

Ok - here are the pictures. Hope someone can solve the mystery.

 

[Stoned06]

IN the first pic it looks like there is a cut hose behind the corrugated cover. Look at the top center.

 

[Tick]

That is just one of the studs that the master cylinder is mounted to.

 

[trdragons44]

is the expy 4x4 or 4x2. in my opinion it looks like a vent line (some are very small on my truck)since its run in the corrugted cover. is there a way you can take pictures/ trace it down the line?

 

[Tick]

It is 4x4, it just seemed way to small to be the front differential vent line. I'll try to trace it.

 

[Tick]

I won't be able to trace the mystery line until my wife gets home next week.

Is there any chance someone with a 2004 can just check to see if they have the mystery line clipped below the master cylinder and whether or not it is plugged?
Thanks

 

[ELVATO]

Don't have anything on mine. Mine is an 03, 4.6L, 4x2.

 

[Tick]

Thanks ELVATO. This is really strange.

 

[Stoned06]

I don't have one in that location on my '06, but I do have one in the same corrugated wrap that ends just in front of the shock tower under some hard lines.

 

[ELVATO]

Do you have 4x2 or 4x4?

 

[Stoned06]

I have a 4x4

 

[Tick]

Hey Stoned06, is the line by the shock tower plugged?

 

[Stoned06]

No. It ends under the hard lines and doesn't have a cap or plug.

 

[Tick]

Thanks. That probably means it is the front differential vent line.