I have to remove the master brake cylinder to replace my vacuum pressure sensor and I was wondering if I can simply empty the reservoir and refill it with clean fluid once I'm done or do I need to just flush the whole thing?
I also might replace the vacuum pump while I'm at it, but it's only throwing a code for the sensor. If I did replace the pump, I can access it more easily just from the wheel well and all I need to do is unhook the vacuum hose. Would I be able to just pinch the hose shut and do this or am I back in the situation above?
***Since this post is now being cross posted and referenced, here is the part information***
Part number: 34302283605 (includes both sensor and vacuum line)
Real OEM diagram (#12):
http://www.realoem.com/bmw/enUS/show...diagId=34_1627
Purchase link:
https://www.ecstuning.com/b-genuine-...e/34302283605/