E90/E91/E92/E93 (2006 - 2013)
I have an 07 e92.
A couple of months ago, I noticed that if I just touched the brakes at highway speed, I could hear a slight rumble coming from the rear drive train. At first, I thought it was a warping rotor but it doesn't have the associated pulsation or "loping" stop that a warped rotor...