Originally Posted by bostontrevor
Don't make me post mine again.
do it! do it!
most modern hydro disk brakes are closed resivoir so unless you're actually pumping the brakes while the bike is upside down, you ain't introducing air into the system. I've been a mech off and on for close to a decade now and have used stands to work on my bikes, the decade before that I just flipped my bike on the saddle to spin the wheels. No problems.