Hydroboost question
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Senior User
Joined: Jan 2005
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Hydroboost question
2007 F350
I noticed I have a small power steering leak where the master cylinder bolts onto the hydroboost. Is there a o-ring or seal between the two? or do I have to replace the hydroboost?
Been looking online for a schematic but can't seem to find one.
I noticed I have a small power steering leak where the master cylinder bolts onto the hydroboost. Is there a o-ring or seal between the two? or do I have to replace the hydroboost?
Been looking online for a schematic but can't seem to find one.
Token Redneck
Joined: Jun 2007
Posts: 9,331
Likes: 341
From: Breckenridge, TX
Book doesn't show a seal between the MC and HB units. Not that the book does always show everything, but for example on fuel injectors it specifically addresses the seals in the Motorxraft seal kit, so if a seal was vital it seems like they'd show it.
Hotshot
Joined: Dec 2014
Posts: 17,823
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From: Jersey Shore
The seal is in the HB, and not field serviceable. The area between the M/C and HB is "dry".
The typical failure mode is for the rear sealing cup of the M/C to have a slight brake fluid leak. Then the truck starts to develop dragging brakes with two brakes on an axle or all four brakes at the same time (Not the cause of one wheel brake hangup) due to rust buildup between the HB pushrod and the M/C piston. You can remove the two M/C retaining nuts and pull the M/C forward and it will have rust particles drop out.
If the truck was a vacuum boosted truck the brake fluid would be pulled into the intake manifold or vacuum pump if it was a diesel.
The typical failure mode is for the rear sealing cup of the M/C to have a slight brake fluid leak. Then the truck starts to develop dragging brakes with two brakes on an axle or all four brakes at the same time (Not the cause of one wheel brake hangup) due to rust buildup between the HB pushrod and the M/C piston. You can remove the two M/C retaining nuts and pull the M/C forward and it will have rust particles drop out.
If the truck was a vacuum boosted truck the brake fluid would be pulled into the intake manifold or vacuum pump if it was a diesel.
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Its without question PS fluid, I have to refill that at least once every month with a bottle. Brake fluid has never changed.
Anyways it comes out on the bottom side of where the two mounting bolts go to mount the MC to HB.
Has anyone used the reman HB? or stick with OEM and new
Anyways it comes out on the bottom side of where the two mounting bolts go to mount the MC to HB.
Has anyone used the reman HB? or stick with OEM and new
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Hotshot
Joined: Jul 2005
Posts: 13,834
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From: Middle Tn.
Its without question PS fluid, I have to refill that at least once every month with a bottle. Brake fluid has never changed.
Anyways it comes out on the bottom side of where the two mounting bolts go to mount the MC to HB.
Has anyone used the reman HB? or stick with OEM and new
Anyways it comes out on the bottom side of where the two mounting bolts go to mount the MC to HB.
Has anyone used the reman HB? or stick with OEM and new
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Senior User
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Is this a test to see if I know the difference between BF,PS and ATF?
No problem, I asked just in case I had misunderstood how the hydroboost works.
No problem, I asked just in case I had misunderstood how the hydroboost works.
Token Redneck
Joined: Jun 2007
Posts: 9,331
Likes: 341
From: Breckenridge, TX
The power steering/hydroboost system on this truck uses ATF and not necessarily stuff from bottles labeled "power steering fluid". If you're adding the green mineral-oil based power steering fluid it's not the correct stuff.
Hotshot
Joined: Jul 2005
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From: Middle Tn.
The correct atf is Mercon V.
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