No Porsche content, so Off Topic, but still automotive.
2017 Acura RDX (5-seat version of the larger MDX)...time for front brakes and rotors after 48k miles. Done this job many times on other vehicles, and the RDX's calipers, rotors, anti-squeal springs/shims, etc. all quite straightforward. No drama fitting new OEM parts.
In the past, my little slice of lasagna was always able to pump the pedal on other cars while I turned the bleed screws, but decided to get a fancy air-powered vac system:
It worked great sucking the master cylinder empty, and with a fresh fill, I attached the fitting to left side front brake bleed screw. Started the vac, opened the screw, and voila! Great gobs of brownish fluid and bubbles. Watched the master cylinder level, topped off a few times, and after nearly 10 minutes, got clear fluid flowing, but LOTS of bubbles still in the line?!?!?
Tried 'barely' opening the bleed screw, but did not see any change except slower flow. I could simply not seem to clear all the air out of the line, and suspect it might have been drawn in from the bleed screw threads?
Got Mrs. Robert out there for the old reliable pedal pump & hold drill, and no more bubbles. Brakes road tested great.
What did I do wrong? Wondering if there is a slightly different procedure to properly bleed air from the system; it does have ABS...
I will reach out to the MityVac support, but thought I'd ask here as well. Thanks in advance for any tips.