Sorry for my ignorance here, I am awaiting delivery of my M3. Does this phantom braking only happen with AP on? It sounds quite worrying. I presume autonomous emergency braking when not using AP works differently?
It's mostly when AP is engaged. I did, however, have a very bad instance of autonomous emergency braking when slowing at lights on a roundabout. AP was not on, but the car thought my approach speed to the car in front was too fast (it wasn't). It slammed on the brakes, proper emergency stop. I was very lucky there was no car behind me. It's the only time in 12,000 miles that it has done this though.