Quote:
Originally Posted by SakhirM4
Maybe you don't drive on unimproved gravel roads.
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You don't have to drive on gravel roads to experience this problem. During the Euro Delivery of my 2016 M4 in May 2016 were were driving on a paved mountain road in Italy, but it had a lot of pebbles on it from the "shoulders" of the road and I picked up one which made me immediately pull off the side of the road when I was able. Then I remembered that I had read about this on the F80/F82 forum and realized what it was. Fortunately, stopping allowed the pebble to drop out. Sounded pretty horrible though and this happened less than a week after I took delivery. I thought something catastrophic had happened to my car. The first time I had the rear wheels off after I got the car home, I just bent back the backing plate slightly and I haven't experienced this since then. There's a TSB on this and updated part numbers for the F80/F82 M3/M4. My wife's 2018 M3 has not experienced this problem so she probably has the updated backing plates.
Other people I know have experienced this when doing canyon runs, which invariably has rocks/stones/pebbles on the roads. This happened so someone else just this past weekend on a club drive on the windy, twisty roads of east San Diego county, all paved roads.