Is it normal for the brake light at the top of the tailight to flash and blink really fast while braking?

 

I don't believe that is the Lexus factory standard, but I've had other vehicles where the dealer installed a mod that caused that behavior. You could try checking with the original selling dealer to see if that's something they do.

 

Yeah... maybe something like this?

 

For European market, I believe there is a requirement to have break lights to be blinking when you have a hard breaking if traveling over 90 km/hour (roughly 50 mph)....... If someone had modified to behaving such way......

 

Apparently my dealer did the modification as a special feature of their dealership. Its called PULSE.

 

most of my Lexus (5 out of 7) have this $395 feature and yes it is Pulse. They advertised it as safety enhancements.