I can be driving around and both the ABS (yellow) and Brake (red) just come on in my Suburban. When I start the car the next time they have turned off. This occurs maybe twice a month, and in summer and winter.
Occasionally the ABS and red Brake idiot lights come on in my truck. on 2001 Chevrolet Suburban 1500
It's not unusual for the ABS Module to be the cause of this problem.
There is a fault in the Anti-Lock brakes system. Have the ABS module scanned for codes.