I have all exterior lights LED and coded out. On the rears on many bmw cars there are enough lamps the car will use a backup set that are usual running lights and convert them to brake function which looks weird because not symmetrical but still gets you brake on both corners. Not sure if any e53 had that ability but e90 has and I suspect e70 also.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)