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Q: brake light flashes on 1991 Chevrolet Suburban 2500

brake light flashes 3 short and 1 long what does this mean
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Sounds like your ABS system has a fault code stored in memory. A code 1 is a problem with the ABS ECU thus the 1flash.
A code 3 is an open dump valve code, thus the 3 flashes.

Best to see a shop that knows how to deal with an ABS problem:

http://repairpal.com/chevrolet-repair-in-west-suffield-connecticut
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