Originally Posted by
benaroundawhile
1. Air shocks use oil.
2. If you have air in the brake system, the bubble needs to only move out of the caliper. Regardless, you'll still have adequate braking.
This has held true for my past 20+ years of use of hydraulic brakes from a variety of companies.
The first time I hung my Crosstrail from the ceiling, the rear brake lever was totally mush for the first couple of miles after I pulled it down for a ride. No issues with the front, but that's a much shorter circuit. The rear brake returned to normal, after a few minutes, and I don't hang it upside down, any more.