Has anyone tried this and seen if it works. I would be so happy if this works. I've had this problem for 3 years and have had my brakes sensors, pads, and just about everything changed multiple times only to have the sound come back after about 1-2 months every time.
What's worst is that this is probably the second biggest issue with this car other then the High Fuel Pressure Pump, but unlike that problem BMW just ignores this problem because there is no liability on them just because your car makes a squeaking sound unlike the fuel pump issue.
I can't begin to explain how much money(now that its off warranty) and time I have wasted to bring my car in to change everything and the dealership saying everything should be fine now, only to hear the same noise after about a month. So the end solution has been to just ignore the noise and hope no one else can hear it.