For those wondering how the flash sequence works, check out my video in the OP.
Upon initial braking it will flash and then go solid. If you press the brake within 10 seconds after the initial braking it will stay solid. The solid timer resets if you don't press the brake pedal after 10 seconds following that.
So the video shows the initial braking, followed by a following press before 10 seconds and then another initial braking after a 10 second wait time.