Power Steering
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Senior User
Joined: Feb 2008
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From: San Diego
Power Steering
OK lately my truck has been making a noise that sounds like a vacuum leak when I turn to or close to full stop on the steering. It is not whining from the pump that I can tell. On the PSD could it just be a different whining than on other vehicles? I think it happens mostly when in slow parkinglots and such. Could it be a problem in the brake system? I thought I read that the brake booster is a part of the power steering system? I checked the fluid and it is full and didn't smell burnt. Would a flush be a good idea for a starting point?
Again thanks in advance for all info.
Again thanks in advance for all info.
Logistics Pro
Joined: Jun 2005
Posts: 4,243
Likes: 16
From: AZ
OK lately my truck has been making a noise that sounds like a vacuum leak when I turn to or close to full stop on the steering. It is not whining from the pump that I can tell. On the PSD could it just be a different whining than on other vehicles? I think it happens mostly when in slow parkinglots and such. Could it be a problem in the brake system? I thought I read that the brake booster is a part of the power steering system? I checked the fluid and it is full and didn't smell burnt. Would a flush be a good idea for a starting point? Again thanks in advance for all info.
Again thanks in advance for all info.
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Senior User
Joined: Feb 2008
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From: San Diego
I plan on flushing the fluid probably next week if time allows. But I am wondering if someone has had this problem before, it sounds like more of a vacuum type sound than a pump or steering rack/box. What about the brake system? Is it apart of the power steering pump some how or am I totally off on this one? It seems the site is slow in the AM for me so I have not been able to search on this.
Smokin
Joined: Jun 2006
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I'm not sure about the vacuum sound. Do you have the push button 4wd on your truck?
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Senior User
Joined: Feb 2008
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From: San Diego
Yes I do have the ESOF on my truck, it's a **** not a button. I will check to see if it is working properly. I only hear the vacuum sound when I am turning the wheel at lower speeds. Seems to happen more when there is more of a load on the system.
Smokin
Joined: Jun 2006
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...but at least I got my point across. I would see if you have a vacuum leak there, as far as I know that would be your only source of any kind of vacuum in that vicinity.
Smokin
Joined: Jun 2006
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just saw that your truck was a '99. Seems there has been a TSB on the vacuum in those trucks with ESOF.
PowerStroke bulletins and parts It's also noted on dieselmann's page.
There are ppl on this site that know a WHOLE LOT MORE about this than I do. Hopefully someone chimes in.
Date: 10/01/2004
Component Name: 033100 SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM
NHTSA #: 18223
SUMMARY: VACUUM PUMP INOPERATIVE OR RUNS CONTINUOUSLY - CLIMATE CONTROL DEFAULTS TO DEFROST. OASIS. TO ALSO INCLUDE 2005 SUPER DUTY F-SERIES, EXCURSION, AND F650/750. *TT
Component Name: 033100 SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM
NHTSA #: 18223
SUMMARY: VACUUM PUMP INOPERATIVE OR RUNS CONTINUOUSLY - CLIMATE CONTROL DEFAULTS TO DEFROST. OASIS. TO ALSO INCLUDE 2005 SUPER DUTY F-SERIES, EXCURSION, AND F650/750. *TT
There are ppl on this site that know a WHOLE LOT MORE about this than I do. Hopefully someone chimes in.
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Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
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From: Grand Lake, La.
Once you turn the switch to 4x4, it puts vacuum to the front hub for so many seconds, then the vacuum stops. It does not keep a vacuum on the hubs. When you turn the switch back to 2x4, it puts a little vacuum back to the hubs to get them to release, then stops the vacuum. 
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Smokin
Joined: Jun 2006
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Once you turn the switch to 4x4, it puts vacuum to the front hub for so many seconds, then the vacuum stops. It does not keep a vacuum on the hubs. When you turn the switch back to 2x4, it puts a little vacuum back to the hubs to get them to release, then stops the vacuum.
Sleek I also found this when I did a search:
https://www.ford-trucks.com/forums/4...ake-pedal.html
https://www.ford-trucks.com/forums/2...depressed.html
Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
Likes: 4
From: Grand Lake, La.
Tnx Rick. Thats why I opted for a truck with manual hubs. Less stuff to worry about. If something was inoperable could it cause a vacuum sound, like sleek has been describing?
Sleek I also found this when I did a search:
https://www.ford-trucks.com/forums/2...depressed.html
Sleek I also found this when I did a search:
https://www.ford-trucks.com/forums/2...depressed.html
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Senior User
Joined: Feb 2008
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From: San Diego
Quick update, My 4x4 is not engaging in auto mode so that might be part of the problem. I will keep everyone updated when I find out what this is exactly. Thanks Smokin for pointing that out and for the links.
Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
Likes: 4
From: Grand Lake, La.
I tested my truck this weekend, and turning the steering wheel, I hear the same sound you hear just before you hit the max turn. It does sound like a vacuum leak, but it is not.
Maybe some else can confirm this by doing the same test.
Maybe some else can confirm this by doing the same test.
Lead Driver
Joined: Jun 2007
Posts: 7,760
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From: Hampton, Maryland.
Will do it in a few minutes and report back.
Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
Likes: 4
From: Grand Lake, La.
Thanks Jason. I can't imagine where a vacuum leak would come from just by turning the steering wheel.