allinon72

I replaced the solenoid right after I got the truck...so for me it's either the check valves or I have a leak somewhere. It's not a big leak - I just have the slightest grind when I am turning right. Hell it might not even be the IWE but it's coming from the front somewhere.

techrep

iTrader: (1)

jack it up and play with the wheel...very well could be a brake issue or wheel bearing

60DRB

Trouble shoot the [vacuum] system before throwing a bunch of parts at it. It's not that complicated.


https://www.f150forum.com/f72/how-diagnose-your-4x4-system-esof-186872/

http://www.ford-trucks.com/forums/836438-everything-you-wanted-to-know-about-the-iwe-system-and-then-some.html

LiftedsKRew

Odds are that one or both of your IWEs are leaking. You need to get a vacuum pump and gauge, get under the truck, pull off the vacuum lines from each hub and test them to see if they will hold a vacuum. The iwes are basically a diaphragm and the rubber dries out and cracks resulting in a leak that causes you problems.