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post #1 of 4 (permalink) Old 08-24-09, 01:56 PM Thread Starter
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Engine difference 2005 Nav v 2005 Mark LT

Hi Guys,
I am having major problems with the brakes in my Nav. The dealer says the brakes are in good shape, but to get the car to stop we are really having to brute force the brake pedal down.

I have found this recall for the Mark LT, Does the 05 Navigator have the same engine as the Mark LT? My dealer claims no...but I'd like independent verification:)

Thanks!
Steven

"Affected vehicles: Certain 2005-2006 F-150 and Mark LT vehicles equipped with 5.4L 3-valve engines
Situation: The brake booster vacuum hose attached to the intake manifold fitting on the affected vehicles may swell over time and lose retention force. This condition could allow the hose to detach from the fitting during an engine backfire, resulting in loss of power brake assist and increased brake pedal effort. As a result, stopping distance may increase and potentially result in a crash."
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post #2 of 4 (permalink) Old 08-24-09, 02:28 PM
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Re: Engine difference 2005 Nav v 2005 Mark LT

If the hose came off, you'd have a high idle speed and VERY hard to stop. It would be like when the engine is off.

One check of the booster is by pumping the brakes a few times with the engine off. Then hold the brake pedal down and start the engine. The pedal should drop a little when the engine starts as it draws out the vacuum.
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post #3 of 4 (permalink) Old 08-24-09, 02:45 PM
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Re: Engine difference 2005 Nav v 2005 Mark LT

Recalls are generally safety related, however, check for any TSB's (technical service bulletins) for your vehicle. You might get lucky and find something similar or perhaps something entirely different. Original owners generally get mailed info on the TSBs, but a second owner isn't notified and has to check with the dealer. I'm not sure, but you might find some info on the NHTSA website.

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post #4 of 4 (permalink) Old 08-24-09, 03:22 PM Thread Starter
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Re: Engine difference 2005 Nav v 2005 Mark LT

"The brake booster vacuum hose attached to the intake manifold fitting"

I've been googling trying to find a picture of this. Is this a hose that would be visible by just opening the hood? Or would it be hidden under something?
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