I think I have the same sound too. I agree it wasn't there when the car was new. For me it started maybe half a year or so after it was new. I also notice it when I hit a bump with both front tires evenly, going at a slow speed. For example, when hitting a speed bump, I hear the same tap sound as when I initially hit the brakes. Or, when pulling into a driveway and it hits the curb edge at the end of the driveway. As a result, I think it has to do with the suspension on my car.

I have had the dealer try to fix it several times but each time they think they fixed it and when I picked up my car it still made the sound. I've given up at this point.

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2022 X5M Comp Dravit Grey/Full Silverstone
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2018 M5 Black/Full Silverstone
2015 X5M Donington Grey/Full Silverstone
2010 X5M Space Grey/Full Silverstone
2003 4.6is Silver/Black