After seeing
this post on FB, I wonder if the little BMW bike brake reservoir has enough capacity for track use?
Nice looking setup anyway

, although I'm not keen on the long hose, so assuming I do it (have lost very little PAS oil so far) I'd go for a shorter hose and see if I can find some kind of quick fit connector.
What's been your experience
kaiv and others?
Also I don't see how some of you are getting pressure build up on that setup seeing as brake reserv. caps have a vent hole in them (they have to, to allow air to come in and out as the brake fluid goes in and out for their original use!).
Are you sure you haven't just got a bad fit into the PAS cap vent hole?