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Old 01-03-2015, 01:38 PM   #1
flaresadog's Avatar
Join Date: Jul 2011
Posts: 52
Unified brake Jeep GC problem

I just bought a used 2004 Jeep GJ to replace the newer Ford Fusion I was towing. I have a Unified brake system and I transferred it over from the Ford.

When testing the system by pulling the breakaway lanyard, the vacuum pump does not appear to have enough volume or suction to allow the brakes to properly activate. If I run the toad engine the unified solenoid plunger can activate the brakes as designed but when activated with just the unified pump, there is not quite enough power to pull the pedal down. All of the voltages at the various components are good and grounds are all solid. The vacuum check valve appears to be working.

Has anyone ran into this kind of issue with the unified brake system?

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Old 01-03-2015, 04:41 PM   #2
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Join Date: Mar 2009
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I have recently read of this problem in one of the forums (or more) that I visit, seems that some JEEPS have a problem with the vacuum booster leaking a bit.. That is best I can remember, since I do not have a jeep.
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