Hi, I have a 1995 Blazer 2dr. I've only had it a couple of days, but the ABS light and brake light seem to be coming on randomly. I was at a stop light and the ABS light came on for a couple of minutes and then went off. When I arrived home, the ABS light and then the Brake light came on for about twenty seconds and then they went off. One thing that I noticed is that I had just turned on the a/c when the ABS light came on the first time, and the second time (ABS and Brake light) they came on right when I rolled down the driver's side window. Thanks for your help!

 

Its possible that you could have a bad ground or something. The ABS system may have stored a fault code.

 

Haha! This helped me, too.
I was about to do a search, and saw this. 'Cept mine just does it randomly after startup. Not always when I'm moving, though...

 

I don't know if this has anything to do with the problem, but last night after changing my fuel pump I started up the car. I shut it off and then a couple of minutes later it made a clunking noise and the electrical completely died: no dome light, warning lights, clicks or anything. After about an hour I tried again and the dome light and warning lights came on, but when I tried to turn over the engine everything went black again. I checked the voltage at the battery and it showed 12.7 volts. Could this be related in any way?