2007 ford f-150 5.4 triton 4x4 front hubs dont engage

I checked the fuses and relays and they seem to be working . like I said when I put it in four wheel drive high or low the front hubs wheels dont engage but the dash light is on saying its on please help thank you
Asked Jan 05, 2013
Check your vacuum lines to the actuator
Answered Dec 09, 2013

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