Question about 2006 Ford F-150
Sound like the vacuum line is off the IWE solenoid ( on the firewall ) or there is a problem with the vacuum reservoir ( behind the battery box ).
The IWE solenoid controls vacuum to the IWE ( Integrated Wheel Ends ) to pull the hubs out ( spring loaded to push in without vacuum ).
You can pull one of the IWE vacuum lines ( the other line is a vent that leads into the engine compartment and is open ) and test with a vacuum gauge when the switch is in the 2H position, you should have vacuum on the line.
If not, you will need to trace back the vacuum lines to find where the leak is at ( if it is what I think it is ).
This is a block diagram of the vacuum system to work from ( not the physical routing ).
This is starting point, the other problems get into the IWE itself.
Posted on Jun 05, 2010
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Posted on Jan 02, 2017
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