1500 silverado brake light

I have a 92 1500 silverado, when I'am driving it down the road and get up to 37 mph the brake light comes on and doesn't go out until i turn off the truck, It then resets and does it all over again. It only comes on when i get to 37mph, if i stay under it will not come on, what do ya'll think it could be?? :banghead: :banghead:

Which brake light are you referring to? I'm assuming you mean the dash warning light and not the tail light. Get an OBDI scanner that will read abs codes and see what you get. Probably a bad abs sensor. Shouldn't be to difficult, as I recall 92's only had rear wheel ABS.