F150 MYSTERY GRINDING NOISES $8 FIX

Diagnosing terrible grinding noises coming from the F150 front end.  The 4x4 front hubs were locking and unlocking while driving down the road.  It sounded like a brake issue or a loose heat shield.  This is a common issue on 2004+ F150s with integrated wheel ends (IWE).  There's a TSB from Ford for this here:
https://static.nhtsa.gov/odi/tsbs/202...

Check valve here:
https://www.amazon.com/gp/product/B00...

• #autos_vehicles
• #f150_iwe
• #iwe
• #f150_4x4
• #grinding
• #noise
• #rattle
• #check_valve
• #solenoid
• #vacuum_leak