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Looking for some help on a vacuum line. I have a 2002 f250 superduty 5.4 4x4. Well i was just checking my front brakes when i noticed a nipple on top of the front axle gear box was without a hose on it. I do not see one in the area either. I guess this would explain why my 4x4 wouldnt work w/o locking the hubs. Where would the hose for this be coming from or going to? I haven't the slightest on this. Even if the hose is missing and i have to replace it, thats fine, i just need to know where it would go to. I have covered up the nipple to prevent anything getting inthere.