Im not to familiar with the E90 platform, so I can tell you how it works on the E36/46. The sensor is located on the right front brake pad, and not both. Theirs one on the front, and one on the rear. On the E36/46 the sensor is only tripped telling you to replace the pads when the pad material reaches a certain thickness.
Im not a big fan of iDrive because sometimes those milage counters are wrong. The best and foolproof way to tell is to take the wheel off. If you only have 2-3mm of pad left, then you better get on replacing them. The front brakes are a 66/35 brake bias, so the front brakes usually wear out twice as fast as the rears.
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