This is called an ABS activation event. That means that the ABS is thinking that it needs to pulse the brakes due to some aggressive breaking situation. I attached the basic operation of the system. Most important thing is the signal inputs to the ABS that it looks at to determine if it is needed. I suspect you have an issue with the stop light switch. It may not be the sensor itself but I suspect the issue is with this input. Do you have a scan tool that we can look at the switch state and see what the pressure it is reading?
Images (Click to enlarge)
Saturday, December 14th, 2019 AT 4:56 PM