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Q:

brake light flashes on 1991 Chevrolet Suburban 2500

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brake light flashes 3 short and 1 long what does this mean
(1) Answer
(1) Comments
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/directory?address=06093&car_brand_names=Chevrolet