Brake Light Codes??

[big jimmy 91]

Does anyone know what it means when the brake light flashes in a 4 sequence after the light comes on

This is in a 91 full size jimmy , stock drive train (350 , 700R , NP241 , 10 bolts)

Any thoughts??

 

[readymix]

The only time i have heard of that is when hte ABS system is malfunctioning....not sure if that applies to you though