Improperly cleaned mating surfaces (rotor to hub), improperly cleaned mating surface of wheel (hub, rotor, back of wheel), improperly torqued lug studs or a malfunctioning caliper. And since it's not just one rotor warping and all calipers are not likely to fail at once, i would rule this out. Severely worn front suspension components can also contribute to the cause, but I wouldn't suspect that on a car as new as yours. Quite frankly, I've always been very supsect of the continental tires BMW puts on the cars. They are junk and their specs vary GREATLY from one tire to another. They have been known to lose their balance very quickly as well. Also, if you are driving a standard and whenever you let off the gas to come to a stop and don't allow the trans to slow you down also (by pushing in the clutch) that means you are souly relying on the brakes to stop the car and not engine/trans also. You take alot of strain off of the brake components by allowing the engine and gearing to slow you down also. Obviously this is most important coming down from high speeds and not puttin along in traffic. As you can see, many things can contribute to your problem.
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