Originally Posted by chriszeh
they dont flash they have a second higher intensity so get brighter on full braking.
They do flash, I've seen it on track. And I'm not talking about the hazard/emergency yellow lights that come on when you come to a near halt after braking hard. It might be different for US cars. Previous generation BMWs had higher intensity brake lights that come on, but most current gen BMWs with LED lights flash for Brake Force Display.