Brake Force Display (BFD) is a system developed by BMW for alerting tailgating drivers of a potential hazard in front of their vehicle. It works by increasing the intensity of the brake lights under heavy braking. The extra lighting is triggered only after the ABS sensors detect a rate of deceleration in excess of 5 m/second (emergency braking), but not under normal braking in order to avoid unnecessary illumination.
Related post
What is ABS?
Related post
What is ABS?
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