See also:

Tire inflation pressure values up to 100 mph/160 km/h
320i 328i 335i ...

The concept
BMW X5 BMW X5 ▷ During normal brake application, the outer brake lamps light up. ▷ During heavy brake application, the inner brake lamps light up in addition. BMW X6 BMW X6 & ...

Activating HDC
Press the button; the LED above the button lights up. ...