Hydroboost moaning or hoses moaning?
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Senior User
Joined: Apr 2004
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From: Ohio
Hydroboost moaning or hoses moaning?
On my 04 f350 I've had a moan or noise I think is coming from the hydroboost unit or maybe the lines. This started intermittenly maybe a year ago. I did a power steering flush in the spring. This seemed to help some. But now it is back more often. The moan or noise happens when your driving and you let off the gas and it happens when your applying the brakes. This does not happen all the time but is getting more constant. Turning the steering wheel does not seem to create the noise. Nor can I duplicate the noise just by reving the engine and letting off. It only happens when your driving or coming to a stop.
I've done some searching and read that there is a relief valve in the hydroboost that can make this noise. I've also read that there was a problem with the hoses expanding and creating this noise. Has anybody else had this problem and what was your fix. I have a new hydroboost unit sitting there but am not sure this is the true fix.
I've done some searching and read that there is a relief valve in the hydroboost that can make this noise. I've also read that there was a problem with the hoses expanding and creating this noise. Has anybody else had this problem and what was your fix. I have a new hydroboost unit sitting there but am not sure this is the true fix.
I'm hitting easy street
Joined: Nov 2009
Posts: 6,395
Likes: 27
From: Central Oregon
Thud is the blend door.
Some years back there was an issue for a droan or moan, seems like it had something to do with the turbo and pedestal.
Do a search on droan and see what pops up.
Some years back there was an issue for a droan or moan, seems like it had something to do with the turbo and pedestal.
Do a search on droan and see what pops up.
I'm hitting easy street
Joined: Nov 2009
Posts: 6,395
Likes: 27
From: Central Oregon
Here is a thread:
https://www.ford-trucks.com/forums/9...akes-moan.html
And here is a thread of threads on the topic.
Ford Truck Enthusiasts Forums - Search Results
https://www.ford-trucks.com/forums/9...akes-moan.html
And here is a thread of threads on the topic.
Ford Truck Enthusiasts Forums - Search Results
Thread Starter
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Senior User
Joined: Apr 2004
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From: Ohio
Thanks for the links. I read through them but they all talk about brake problems. All the pads all the way around are new within 3-months. The front rotors are new the rear e-brake plate and e-brake pads and hardware are new.
Also some of the turbo droan issues talk about if you have an aftermaket exhaust on it takes it away. I have a kitty delete and 4" cat back installed plus Have always run a SCT tuner with custom tunes and have the ARP studs installed.
The only turbo problem I have is I need to pull the turbo and do the cleaning since my does the chirp on start up on cold days.
Also some of the turbo droan issues talk about if you have an aftermaket exhaust on it takes it away. I have a kitty delete and 4" cat back installed plus Have always run a SCT tuner with custom tunes and have the ARP studs installed.
The only turbo problem I have is I need to pull the turbo and do the cleaning since my does the chirp on start up on cold days.
Hotshot
Joined: Jul 2005
Posts: 13,834
Likes: 25
From: Middle Tn.
On my 04 f350 I've had a moan or noise I think is coming from the hydroboost unit or maybe the lines. This started intermittenly maybe a year ago. I did a power steering flush in the spring. This seemed to help some. But now it is back more often. The moan or noise happens when your driving and you let off the gas and it happens when your applying the brakes. This does not happen all the time but is getting more constant. Turning the steering wheel does not seem to create the noise. Nor can I duplicate the noise just by reving the engine and letting off. It only happens when your driving or coming to a stop.
I've done some searching and read that there is a relief valve in the hydroboost that can make this noise. I've also read that there was a problem with the hoses expanding and creating this noise. Has anybody else had this problem and what was your fix. I have a new hydroboost unit sitting there but am not sure this is the true fix.
I've done some searching and read that there is a relief valve in the hydroboost that can make this noise. I've also read that there was a problem with the hoses expanding and creating this noise. Has anybody else had this problem and what was your fix. I have a new hydroboost unit sitting there but am not sure this is the true fix.
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Senior User
Joined: Apr 2004
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From: Ohio
If I don't have to install a $250 unit but fix it with something else I want to try that. I can always return the new hydroboost.
I have other hydroboosts units I've installed or used on vehicles over the years but have never had an issue like this. Sometimes I've found it's just something simple or something I've overlooked that is the problem.
I have other hydroboosts units I've installed or used on vehicles over the years but have never had an issue like this. Sometimes I've found it's just something simple or something I've overlooked that is the problem.
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Hotshot
Joined: Jul 2005
Posts: 13,834
Likes: 25
From: Middle Tn.
If I don't have to install a $250 unit but fix it with something else I want to try that. I can always return the new hydroboost.
I have other hydroboosts units I've installed or used on vehicles over the years but have never had an issue like this. Sometimes I've found it's just something simple or something I've overlooked that is the problem.
I have other hydroboosts units I've installed or used on vehicles over the years but have never had an issue like this. Sometimes I've found it's just something simple or something I've overlooked that is the problem.
Senior User
Joined: Jan 2006
Posts: 344
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From: Reno, Nevada
If I don't have to install a $250 unit but fix it with something else I want to try that. I can always return the new hydroboost.
I have other hydroboosts units I've installed or used on vehicles over the years but have never had an issue like this. Sometimes I've found it's just something simple or something I've overlooked that is the problem.
I have other hydroboosts units I've installed or used on vehicles over the years but have never had an issue like this. Sometimes I've found it's just something simple or something I've overlooked that is the problem.
I ended up replacing my lines to fix my noise my 06 made that noise for about 2 years the lines fixed the noise but i also had replaced the hydrobooster and pump before the lines its now been good and quiet for the last year
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From: Ohio
So do you think the lines where the culprit and not the hydroboost?
The bad part is you can't duplicate the noise unless your driving so it's kinda hard to stick your head under the hood and listen.
The bad part is you can't duplicate the noise unless your driving so it's kinda hard to stick your head under the hood and listen.
Senior User
Joined: Jan 2006
Posts: 344
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From: Reno, Nevada
Ya its hard to say because i had replaced my hydrobooster once and out like 2 new pumps on it and still had the noise i finally had to replaced the pump a 3rd time with a ford one not a napa one and replaced the hydrobooster with a used one i bought off ebay so i cant pin point it i do know that with the line replacement it got really quiet i had the pump good bad a napa one within a few hundred miles of replacement thats when i got a ford pump from ford and the used hydrobooster and replaced those that my problems and noise went away completely
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