Vacuum pump sound on M5 e39
Hi i need some help .. my beast has this pump that start up in the moring with a cold start if go's on for like a 60 sec and then go off it use to have this hight pitch soud like a Vacuum and now the sound change a few weeks ago ist a lower pitch sound and somtimes sound like its having a hard time trying to make the noise now i want to know is the pump on its way out or could it be someting els please help