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Old 05-27-2014, 04:58 PM   #1
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Grinding noise in front end.(Ford F-150)

Returning from a recent trip while pulling up a fairly steep grade my truck began making a grinding noise in the front end. Checking other forums I have isolated the problem to a vacuum system that engages the front hubs (4wd). I took it to the local dealer and they agreed with my diagnoses and replaced enough parts in the front end to cost me $750, but the problem is still there. Anyone have any ideas on what to check as to why I am losing vacuum when pulling up a grade. The truck is a 2008 F150 with 5.4.
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Old 05-27-2014, 04:59 PM   #2
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Broken or cracked vacuum line.

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Old 05-28-2014, 08:30 AM   #3
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I figure that is the problem. Dealer said they had a service bulletin about this and that the hubs were prone to leak so they replaced everything up front. Did not fix. How would I find a bad vacuum line? There is about 100 miles of those lines just under the hood.
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Old 05-28-2014, 08:55 AM   #4
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If you have a vacuum leak,they should be able to do a smoke test. They inject it into a vacuum line and see where it leaks out.

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Old 05-28-2014, 09:02 AM   #5
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Dealer 'fixed' the wrong problem..... Ask for you money back and then take it to a independent mechanic.
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Old 05-28-2014, 10:19 AM   #6
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Yeah don't fall victim to a parts tosser. Now it's on them to fix it properly, but how is a lack of vacuum causing this noise? If it is the 4wd system partially engaging to make this noise that means it's naturally engaged, which makes no sense.

When climbing a grade engine vacuum goes to near nothing, in some vehicles (including Fords) there's an auxiliary vacuum pump that will engage to keep the vehicle supplied with vacuum.

What are the odds you have that pump and it's noisy?
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Old 05-28-2014, 10:27 AM   #7
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Ok, did a little checking. Doesn't appear right off your truck would have a pump, but there is a reservoir right behind/under the battery. That where I'd start, battery fumes have been known to destroy plastics even though the battery doesn't "leak".
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Old 05-28-2014, 11:07 AM   #8
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Just finished reading a thread on the Ford forum. Vacuum keeps the hubs disengaged and when vacuum is removed hubs engage. My vacuum must be dropping when in a hard pull so that hubs try to engage. Front axle is engaged electrically so not turning hence the grinding noise. Truck is still at dealer but I'm picking it up this afternoon regardless and starting to troubleshoot myself. Vacuum reservoir will be first thing I check. I don't think they checked the vacuum system but just replaced both front hubs. There are also check valves in the lines that could be bad causing this.
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Old 05-28-2014, 11:20 AM   #9
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The Ford forum should have been your first stop. Those guys/gals will help you out.
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Old 05-28-2014, 12:23 PM   #10
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Don't think I would be paying for work that did not solve the problem though, I'm surprised they had the gall to return it like that, when I worked in the trade if we erred like that we would make some excuse to keep it and find the original problem so we would not look like fools, it does happen, miss diagnosis.
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