car guy, recovering
Join Date: Nov 2008
Location: Mount Vernon, NY
Bikes: Olympia Competizione & Special Piuma, Frejus track circa 1958, Dahon Helios, many others
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If air was to get into the brake lines, it would have to replace brake fluid, which means you'll see brake fluid leaking from the bike.
Not necessarily. I think all bicycle hydraulic systems are sealed off from the atmosphere (the ones I've seen are, at any rate). This doesn't mean the reservoir has no air in it, though I doubt very much whether it would enter the master cylinder if the bike is upside down. I simply cannot believe the brake manufacturer didn't plan for bikes being shipped, flipped or dropped.
Don't take my word for it, or the LBS either. The best info regarding whether you can hang the bike upside down will come from the brake manufacturer.