I noticed a vacuum line hanging under my 98 F 150 4x4 I traced it out to my front axle question is where does the other end go I have looked but no luck to where it goes.If someone has a answer that would be great thanks.

 

Could it be the vent hose.Where does it attach on the axle ? At the wheel end, center ,ect .

 

My guess is it's the front axle actuator vacuum supply or the disengagment hose..
Bet your 4x4 does not work without it.
Good luck.

 

Looks like it is coming from the center i think from the front axle actuator vacuum assembly it is attached to the actuator but hanging down. The hose is about 2.5 feet long give or take a few inches.

 

two small hoses connect to the vacuum cylinder on the axle pumpkin. This engages the 4 x 4. Hoses run toward the pasenger fender and up that toward the hood. Hoses route to the left side of the truck--- firewall--- by the brake booster. YOu see two vacuum solenoids. When you turn the **** on the dash, these two solenoids engage- disengage, and send vacuum to the axle.

 

Thanks for the info I will look into that