Faulty Brake Proportioning Valve - JeepForum.com
 
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post #1 of 9 Old 01-10-2017, 10:05 AM Thread Starter
Dixierambler
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Faulty Brake Proportioning Valve

I recently eliminated the ABS system on my 94 YJ, I ordered the non ABS proportioning valve and installed it with no problems. However, after a couple of weeks running the Jeep the valve started to leak through the plastic switch mount. Thinking it was just a bad valve, I ordered a second one and have been running it for several weeks. Now the second valve is leaking at the same spot. At $80 a pop I need to find out what is going on and/or why is this happening. I have included a pic for reference. Any help is greatly appreciated.

Thanks,

Jim

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post #2 of 9 Old 01-10-2017, 01:56 PM
jbolty
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are the brakes working normally?
Is the valve centered? (unscrew the plastic switch and look in to see)
Are you certain the lines are in the right places?

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post #3 of 9 Old 01-10-2017, 02:39 PM Thread Starter
Dixierambler
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Quote:
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are the brakes working normally?
Is the valve centered? (unscrew the plastic switch and look in to see)
Are you certain the lines are in the right places?
Brakes have been working fine. I'll check to see if the valve is centered. Pretty sure brakes lines are correct although I will confirm. What puzzles me is both valves have leaked about two to three weeks after they were installed. All stock setup on my brakes. Thanks for your time and help.

JC
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post #4 of 9 Old 01-10-2017, 03:17 PM
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there should not be any fluid in the area. The centering rod should have O rings on both sides to keep it sealed. I would suspect a bad or missing O ring or it's way off center.

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post #5 of 9 Old 01-10-2017, 03:25 PM Thread Starter
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Quote:
Originally Posted by jbolty View Post
there should not be any fluid in the area. The centering rod should have O rings on both sides to keep it sealed. I would suspect a bad or missing O ring or it's way off center.
jbolty, thanks for your time and help. Checked and my brake lines are hooked up correctly. Not sure if the centering rod is centered. I took the plastic brake switch off and really couldn't tell if it was centered or not. What would cause it to be off centered and is there a way to center it? Once again, this is the second new valve doing the same thing as before. Thanks again.

JC

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post #6 of 9 Old 01-10-2017, 04:55 PM
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These may not be a jeep valve but they are all about the same. The rod floats in the middle and if the pressure on front or rear drops, like if a hose blows out, the rod is pushed over to cut fluid to that side. When that happens the rod contacts the switch and turns on the light. The center indented part should be visible if it's centered

The O ring on either side should keep fluid out of the center. You can take the valve apart and check the seals.
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post #7 of 9 Old 01-10-2017, 05:42 PM
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Is there a reason you can't just put the ABS valve back in? I think the only difference is usually that an ABS valve has more rear bias than a non-abs valve, but I don't know for sure on the YJ.

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post #8 of 9 Old 01-10-2017, 05:44 PM
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Just for reference, where the lines go....


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post #9 of 9 Old 01-10-2017, 07:27 PM Thread Starter
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Thanks to all for the replies. Since this is the second valve I have installed in the last two months, I hate to think the seals would be bad in both. However, anything is possible. I thought I might have some kinda excess pressure which was forcing fluid past the seals and up through the brake switch. I don't have the old ABS valve to check.

I think I have read just about every thread on this issue. It seems that there are others who have had this same problem. Unfortunately, none of them appeared to have a fix or cause for the issue, other than plugging the plastic brake switch. If this is a seal issue or just plain faulty valve, I guess I need to look into the warranty end for the valve. Thanks again for the suggestions and help.

JC

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