00 blazer ABS and emergency brake light

The abs and emergency brake light comes on after driving for a while, nothing seems to be wrong but can't understand why? sometimes if i turn the truck off and on again the light will go off.

check your brake fluid. it could be low. otherwise take the truck to get it scanned with an ABS capable scanner. Advance Auto and Autozone do not have these.

both lights on could indicate a real problem - have it looked at immediately