So I've seen plenty of questions and answers out on the 'net about hanging a bike with hydraulic brakes, from up high either upside down or from the front wheel. Up till now I never saw an answer credited to one of the major brake companies.
I wrote Hayes asking about the notion that hanging upside down could be bad... mainly the idea that air bubbles would travel "up" to the calipers...
Here's what I got for a reply...
"As long as the brake has been bled properly there are no issues with any angle the bike finds itself being stored in.
John P Trusky | Warranty & Technical Support Coordinator "
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Thread: Hayes answers my question...