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Old 05-09-2020, 04:08 PM
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Towtruck Towtruck is offline
350 Buick
 
Join Date: Oct 11, 2001
Location: Arlington, Texas
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Brake warning light/Proportioning valve

I was messing around adjusting the e-brake portion of the Eldorado rear disk brakes and lost some fluid in the process. I added some to the . Then I noticed the brake warning light stays on. So, I managed to activate the proportioning valve switch. (I isolated it electrically to the wire on that valve).

The Haynes shop manual is pretty worthless regarding the proportioning valve...some general mumbo jumbo, but no cutaway to see how the thing works. Both front and rear brakes seem to be working OK. How do I reset that switch? I read somewhere that it sometimes will reset by jamming the brakes pedal down really hard. Is that the trick? The dang thing gave me a problem 15 years ago when I installed the rear disks, but I can't recall how I finally fixed it. I think it's some sort of poppet valve...can I manually reset it? I checked old threads and couldn't find anything specific. Is it supposed to rest itself when everything is in order? Thanks
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Last edited by Towtruck : 05-09-2020 at 04:13 PM.
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  #2  
Old 05-09-2020, 11:32 PM
SJTD SJTD is offline
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Join Date: Apr 26, 2012
Location: Lompoc and Sunland, CA
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Maybe crack a bleeder on one of the fronts and push the pedal?

It's a spool that moves off center if the pressure on one side is higher than the other. Some are supposed to have a tool installed when bleeding to keep the spool from moving.

Stupid light on my CJ's been on forever. Maybe I'm the stoopid one for not fixing it.
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Old 05-10-2020, 06:21 AM
Ristow Ristow is offline
 
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Location: The Great Googley Moogley Midwest.
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the tool is to hold the metering valve open. it does not keep or otherwise interfere with the failure switch.


the valve doesn't move until brakes are applied. you can open and drain all the fluid out of one circuit. the valve wont know it until brakes are applied and pressure is made in the other side of the system.



with both circuits bled the valve should put itself to center. yours could be stuck. or your wire that went to the e-brake pedal grounded out while toy were messing around under there.
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Old 05-10-2020, 08:30 AM
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Towtruck Towtruck is offline
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OK, thanks. It's definitely not the E-brake. Maybe there's air in the rear circuit. I'll just have to keep dicking with it.
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Old 05-10-2020, 12:49 PM
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babywag babywag is offline
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I have found a very harsh stomp on pedal frequently "unsticks" valve.
My 88 has done it a couple times when I knew no air was in system.
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Old 05-11-2020, 02:39 PM
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Towtruck Towtruck is offline
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Location: Arlington, Texas
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Follow up. It's fixed. Stomping very hard on the pedal a few times did the trick. Thanks everyone.
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