Hydroboost Voodoo... Begone!

Hydroboost Voodoo... Begone!

Postby longyard [OP] » May 18th 2011, 1:45am

Ever since refreshing my brakes and power steering systems I've had difficulty with steering the van while also using the brakes. I've done a lot of searching on the net for solutions to this problem, and MANY users of hydroboost systems report the same problem. After a long search, I finally found the answer to this most common problem: When going around a corner, if you step on the brakes, you instantly lose all power steering. At other times, the power steering can seem weak. This often happens even after a "new" power steering pump has been installed.

Here is the problem, and solution: The power steering pump is too weak for the demand from both the brakes and power steering systems. A typical GM OE pump is putting out 1300psi, or more. Over time, an OE pump may lose the ability to produce that much pressure. MANY remanufactured pumps are only putting out 700-1,000psi after being rebuilt. Thus the problem. Many people mistakenly attribute this condition to air in the lines somewhere.

The SOLUTION is to buy a NEW AC/Delco power steering pump, or a performance pump built by AGR in Texas.

I hope this helps you avoid the nightmare that I've been through the last week trying to sort out my steering/brake issue!
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Re: Hydroboost Voodoo... Begone!

Postby RECox286 » May 18th 2011, 2:54pm

Hee hee. Or you could cobble in a unit that powers, say, a Kennworth semi, maybe ? I've seen a lot stranger things here on A/S.com...

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Re: Hydroboost Voodoo... Begone!

Postby Uncle Fester » June 6th 2011, 3:06am

Thanks for the heads up as I am guessing that with 175K on the van I will be looking at this sooner or later. . . . . :poke:
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Re: Hydroboost Voodoo... Begone!

Postby swharris » May 10th 2013, 6:25pm

longyard wrote:Ever since refreshing my brakes and power steering systems I've had difficulty with steering the van while also using the brakes. I've done a lot of searching on the net for solutions to this problem, and MANY users of hydroboost systems report the same problem. After a long search, I finally found the answer to this most common problem: When going around a corner, if you step on the brakes, you instantly lose all power steering. At other times, the power steering can seem weak. This often happens even after a "new" power steering pump has been installed.

Here is the problem, and solution: The power steering pump is too weak for the demand from both the brakes and power steering systems. A typical GM OE pump is putting out 1300psi, or more. Over time, an OE pump may lose the ability to produce that much pressure. MANY remanufactured pumps are only putting out 700-1,000psi after being rebuilt. Thus the problem. Many people mistakenly attribute this condition to air in the lines somewhere.

The SOLUTION is to buy a NEW AC/Delco power steering pump, or a performance pump built by AGR in Texas.

I hope this helps you avoid the nightmare that I've been through the last week trying to sort out my steering/brake issue!


From the AGR website they list the PROPER way to bleed a HYDROBOOST PS/Brake system. All should read and heed their procedure. I've extensively searched this site and people continue to have a problem with noise and brake/steering issues after work on the P/S system. Most of the issues I feel are due to air still in the system.

Here is the AGR link http://www.agrperformance.com/AGR-Installation/bleedinginstructions.pdf
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Re: Hydroboost Voodoo... Begone!

Postby 97cargocrawler » May 11th 2013, 12:19am

Interesting.

Thinking of the spring loaded cam design of a power steering pump I fail to see how they could loose a significant amount of pressure over time. Wouldn't the pressure have something to do with the angular velocity of the cam, i.e. the rpm's of the pulley?

I wonder too how the EVO (electronic variable orifice) on the pump is factored in.

Argh! You have made me curious.
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