What will cause the BRAKE warning light to come on? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-01-2006, 11:09 AM
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What will cause the BRAKE warning light to come on?

In my '83 Buick Electra Park Ave the brake light will come, usually on the highway when I'm into the gas pedal a little harder than usual. As soon as I let off the gas the light goes off. The car stops great, the brake pedal is high.

Would a low vacuum situation cause the brake light to come on? If so, maybe I've got a vacuum leak somewhere?? Also, my gas mileage is horrible. Now I know i'm not driving a smart car or anything, but I believe its worse than it should be from what I've read from other owners.

Thanks for any help

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Old 09-01-2006, 11:19 AM
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Not sure about the vacuum. But I do know some cars, particularly higher end like the Buick, have low level indicators. Slightly lower than normal under hard acceleration, braking, or cornering can cause the light to come on. Check your fluid level and if there is a float or some other method of electronically checking the level.
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Old 09-01-2006, 11:21 AM
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Check for a brake fluid level sensor in the master cylinder reservoir. Fluid may be low and sloshing back on heavy acceleration. If fluid is low, check the brakes and check for brake fluid leaks.

Steve
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Old 09-01-2006, 11:24 AM
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If the brake warning light is coming on during hard acceleration or at fast highway speeds, its telling you to SLOW DOWN before you get hurt or to get your foot out of the pedal before you blow something up! LOL

Mark
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Old 09-01-2006, 11:30 AM
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Thanks for the replies everyone.

Well the thing is I'm not talking about hard acceleration, most of the time its just maintaining a constant highway speed (100-120 km/h). The fluid level looks ok. lol I don't think my park ave is even capable of hard acceleration
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Old 09-01-2006, 03:00 PM
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Doc here,

Check the Grommet area where the Low Level Brake sensor wire AND the throttle pass through..They may be chafing on one another..And inspect the sender wire back to it's source for the same..

If that is good, you may have a sender on the master cylinder (or proportioning or differential valve) Going out (slight air leak).

Other than that, I' d Suggest an inspection of the master cylinder from a brake shop..It may be telling you the truth.

On the other..How long since the last tune up? .. May be Due!

Doc
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