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Unread 06-05-2014, 07:05 PM   #1
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1993 YJ Wrangler 
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swapped 8.8 now brake light on

Hey guys I finally swapped in the 8.8 with the help of my buddy. I was called off to work as we were finishing and he said he would just put the brakes back on for me. Well when I got back to get my jeep and drove it I noticed my brake light was staying lit on the dash and the brakes were way too soft. I looked at it more thoroughly this evening and noticed the calipers were put on upside down. Because of this he probably wasn't able to bleed the brakes all the way. Could this be making the brake light stay on? Also, I have read of some people taking out the o-ring in the in the metering shaft in the proportioning valve....but never understand the reason behind this. Does doing that help stopping power? Thanks for all input guys

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Unread 06-05-2014, 07:38 PM   #2
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dont take out anything. And bleed the brakes and the light will go off.
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Unread 06-05-2014, 07:54 PM   #3
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Originally Posted by Jeepsr4me View Post
Don't take out anything. Swap the calipers from one side to the other, bleed the brakes and the light will go off.
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No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

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Unread 06-05-2014, 08:24 PM   #4
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Yeah he mentioned ed the calipers in wrong spot
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Unread 06-06-2014, 09:59 AM   #5
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If the light is still on after you swap the calipers and bleed, give the pedal a nice hard stomp. That what my mechanic friend told me to do and it worked. Ive read it somewhere as well.
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Unread 06-06-2014, 10:22 AM   #6
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1990 YJ Wrangler 
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what they said ^^^.

Chances are the proportioning valve shut off the flow to the rear because the lack of pressure was interpreted as a failure of that circuit. You may need to re-center the shuttle in the valve by hand. Unscrew the brake light switch on the prop valve an see if the shuttle valve is centered; if not you can move it with a small pick.

This is not a jeep valve but is an almost identical design. When the shuttle goes off center it makes the ground that turns on the light.

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