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Go Back   Hummer Forums by Elcova > Hummer H3 Discussion Forums > General H3 Discussion

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  #1  
Old 08-25-2006, 03:52 PM
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PARAGON PARAGON is offline
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Default Re: f5fstop or anyone

It sounds as though it does only work in a Key On position. (sorry I have an H2, just trying to help)

You might need to pump the brakes to "bleed" off the assist each time before you tow and have the brake buddy set to a higher PSI like in a dead pedal situation.
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Old 08-25-2006, 04:03 PM
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PARAGON PARAGON is offline
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Default Re: f5fstop or anyone

here's your solution:



Installation Supplement for Towed Vehicles Equipped with Separate DC Pump for Hydro-Boost Power Brakes

(Includes H3 Hummer)


U.S. Gear Unified Tow Brake (UTB-1000)
Some towed vehicles are equipped with hydro-boost assist power brakes instead of vacuum assist, and some of the hydro-boost towed vehicles use a separate 12-volt DC pump for the hydraulic assist. In those applications, you may install the Unified Tow Brake with one minor installation change. We have outlined this change below.
Note: If the towed vehicle is equipped with hydro-boost where the hydraulic assist is coming from the power steering pump, the Unified Tow Brake will NOT work.
When the hydraulic assist is coming from a separate 12-volt DC pump, follow these steps:
1. Locate the 12-volt DC pump that supplies the hydraulic pressure for the hydro-boost system.
2. Using a test light, identify the wire that goes "hot" when the vehicles ignition is on and is "cold" when the ignition is off.
3. Once you have identified the correct wire, cut the factory wire and install a "blocking diode" into the factory wire that will protect the end of the factory wire that goes away from the DC pump.
4. Once the diode is installed, then you can splice in the "violet" wire in the Unified Tow Brake towed vehicle wiring harness that normally would be used to power the vacuum pump to power the hydro-boost DC pump. Install the "violet" wire into the newly installed "blocking diode" according to the diagram below.
When this installation procedure is completed, the Unified Tow Brake Power Module (PM-6001) will energize the DC pump when needed to keep the power brakes active and alive.
Form 0510hydroboost (Rev. 10/05)



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Old 08-25-2006, 04:04 PM
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PARAGON PARAGON is offline
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Default Re: f5fstop or anyone

Basically, you would provide power to the power assist pump from the RV to keep the pump active.
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Old 08-25-2006, 04:50 PM
Donald Smith Donald Smith is offline
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Default Re: f5fstop or anyone

Thanks Paragon

I had called brake buddy before you posted, all he said was let me know if I figure it out. Got back with him he was glad to have the info also. Time to go looking for the wires.

Don
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