E Brake light won't go out
Le Mans Master
Joined: Dec 2007
Posts: 6,422
Likes: 591
From: McHenry Illinois
That light is also for the brake failure. Check the wire at the proportioning valve under the master cylinder near the frame. Also check the brake fluid levels as one side may be empty and causing the brake warning light to come on.
Safety Car
Joined: Oct 2007
Posts: 4,381
Likes: 1,751
From: Seattle Area Washington
Have you checked the wiring attached to the proportioning valve? It could have been disrupted during removal or installation of motor. On my 1977 this valve is located directly below the PB booster bolted on the frame rail.
Safety Car
Joined: Nov 2004
Posts: 4,359
Likes: 57
From: Mundelein Illinois
I would unplug the wire at the emergency brake and check it. If it doesn't turn off, then unplug the proportioning valve and then check it. The brake light turns on from a ground, so some how that circuit is seeing ground.
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Le Mans Master
Joined: Mar 2001
Posts: 6,640
Likes: 287
From: Ann Arbor Michigan
It's one of those 2.
Drifting
Joined: Oct 2004
Posts: 1,496
Likes: 1
From: Lafayette Louisiana
Sounds like your valve is detecting an imbalance. Push down on the brake pedal very hard as if you are going to push it to the floor and hold it for a few seconds. This will recenter or balance the valve and the light should go out if everything else is ok.
Thread Starter
Advanced
Joined: May 2007
Posts: 59
Likes: 0
I unplugged the wire to the proportioning valve and the brake light went out. Earlier this eveving I also re-bled the rear brakes and got some more air out. Ran out of light so I will do the fronts tomorrow after work. Best guess - air in the system, electrical problem or need a new valve?
Drifting
Joined: Oct 2004
Posts: 1,496
Likes: 1
From: Lafayette Louisiana
As long as you have air in the system the valve could be sensing an imbalance. Get the air out first then try the recenter trick and hopefully that will do it. I have no idea how to test the valve. I got lucky and pressing the crap out of the brake pedal fixed mine.
Melting Slicks
Joined: Dec 2006
Posts: 2,669
Likes: 3
From: Kingston Ontario
Bleed the brakes completely. Then apply a firm brake application to re-centre the combination/proportioning valve. If several attempts does not extinguish the dash warning light you may have to replace the valve, as they sometimes stick in the failed position. Use a hard or firm brake application to re-centre.
Advanced
Joined: Jan 2009
Posts: 72
Likes: 4
From: Bulverde, Texas
Wow- I saw this post and got excited because I had been pulling my hair out over this issue since Oct. It took 3 tries until I felt the brake pedal sink about a 1/4 inch further and .....the light turned off! Brakes grip a little better and stop strait with no pull as well. Great Tip - Thank you!
