is it like that http://www.e90post.com/forums/showthread.php?t=455691 ???
Originally Posted by bmw2012
Thanks for your response. The noise primarily happens when the car is in motion. When I press the breaks or slow down and come to a stop it usually goes away. It's been to the dealer 10 times and they can't find the problem. They recently took out the computer that runs the audio system and put it in a new one, but the noise was still there. They've replaced parts of the A/C system, the noise is still there. I'll suggest the power break booster. thanks.
if so replacing alternator fixed the problem... let me know if it'll fix yours
Last edited by dpwr; 03-05-2012 at 10:32 AM.