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I know the single brake warning light (vs the later two) will light if a brake light's out. Have you checked? If so, replace bulb, confirm fix, disconnect battery, wait 60 seconds, reconnect.
It only takes one failure-to-light to trigger the warning lamp so if a bulb is loose or contact corroded it'll cause the same problem. I learned this when thought I was helping things by applying "bulb grease" (dielectric grease) - never had so many intermittent bulb problems. Cleaned it all out and everything's back to normal.
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1980 911SC
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