Fu(Kin Brake Light! - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 01-09-2002, 07:37 AM Thread Starter
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Fu(Kin Brake Light!

(The One In The Dash)
My brake light seams to be stuck on in my 1985 CJ7! The brakes work great, but the light is still on all the time!

Rodney C
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post #2 of (permalink) Old 01-09-2002, 07:47 AM
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Re: Fu(Kin Break Light!

I assume you've checked your E-brake... otherwise, it could just be a wiring prob. somewhere. The light on those is triggered off the proportioning valve, it's pssible it has a problem in the switch in it too.

89 CJ/YJ thing 350 TBI, 700r4, NP231 SYE, 3 inch body lift, 33's and an appetite for mud!!!
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post #3 of (permalink) Old 01-09-2002, 09:12 AM
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Re: Fu(Kin Break Light!

Maybe if you spelled "brake" right it will work better ... [img]/wwwthreads_images/icons/smile.gif[/img]
Naw, just kidding....

Actually your emergency brake has a grounding switch and the brake systems porportioning valve has a shared grounding switch on them.
The circuit is hot going through your BRAKE indicator lamp in your speedo housing (if its a CJ).
So if the e-brake switch is stuck or it's wire shorted the lamp will glow.
Additionally, if the sliding piston on the top of your proporting valve has shifted due to an extremely disproptionate front vs. rear pressure incident the switch will ground the lamp to activate it.
This switch must be manually repositioned if this is the case.
That one is easy to test with an ohm meter to test whether the line into it does or does not create a closed ground circuit.
Now, see how easy that was ... [img]/wwwthreads_images/icons/wink.gif[/img]

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post #4 of (permalink) Old 01-09-2002, 09:16 AM
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Re: Fu(Kin Break Light!

Threre are two other items on a CJ7 that will cause the brake light to come on:

1. The brake light swtich above the brake pedal may be flaky.
2. The Brakes porportioning valve also signals brake failure.

Best to check it out and get it fixed!

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