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www.ColoradoClassicBroncos.com - View topic - Hydroboost issues
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Reply to topic  [ 7 posts ] 
 Hydroboost issues 
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Post Hydroboost issues
Hydroboost issues
I have had my hydroboost installed for 3 years now. It has always worked great! ...until today.

So I tried to drive it today and the breaks are really soft and spongy. ...both with the motor off and running. When you press the brakes all the way with it running, it's much harder than normal to turn the steering wheel. There sre no leaks and the powersteering fluid is full. I am running the explorer serp front dress.

I have not driven it yet... I don't want to back out of the garage and into the neighbors hours!

So where do you think the problem lies? I think maybe a master cylinder??

Any help is appreciated!

See:
http://classicbroncos.com/forums/showth ... p?t=200589


Sun Feb 19, 2012 10:04 am
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Post Re: Hydroboost issues
ryan when i finally finished mine the power steering pump died , so to test it i put a direct reading guage on it and it would read only 500 psi and bump to 800 if you rev'd the engine . it should run to a 1000 once you rev it . when i turned it the pressure would drop and it took every thing i had to turn it. new pump problem solved .


Sun Feb 19, 2012 7:05 pm
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Post Re: Hydroboost issues
x2. That sounds like a bad pump. A bad MC shouldn't affect your power steering, even if you were putting somewhat increased load on the braking system.


Sun Feb 19, 2012 11:43 pm
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Post Re: Hydroboost issues
Yeah, bad pump. The brakes will feel like regular manual when the pump goes out, but you will still have them, but the steering is the big issue and indicator.


Mon Feb 20, 2012 10:02 am
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Post Re: Hydroboost issues


Mon Feb 20, 2012 4:57 pm
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Post Re: Hydroboost issues
Are they still soft after one pump? The hydroboost has a reservoir that allows the brakes to be powered for at least one solid stop if the engine is off, but I'm not sure how long that will stay pressurized for after the truck is turned off.


Mon Feb 20, 2012 6:08 pm
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Post Re: Hydroboost issues
You will usually only get one solid pump with the engine off, like Justin said, but you will still feel a soft spongy pedal with the engine on. That's because the pump is still circulating fluid, just not at a high pressure. On mine, it feels like a really soft manual, but still similar. I had to rebuild my original pump once and thats what it did. I gotta get off my can and install the dual inlet pump that Zac gave me, which is a saganaw pump, and in my opinion is the route you should go if you haven't already done it.


Tue Feb 21, 2012 10:07 am
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