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After a flight you don't need a full bleed, just a burp. Try and encourage all the air up the lever (tapping the hose, angle the bike). If you have enough fluid, this should cure the problem, if not then stick the bleed cup in the port on the lever with a bit of mineral oil in it and pump the lever a few times. You should see a couple of bubbles come out.
If you have ended up at higher altitude than you started, it could just be a case of opening the bleed port on the lever and letting the air out.
chiroshi
andyfallsoff
I have a similar problem on my shimano set.
Reading on the internet suggests a quick fix with washing up liquid on the pads, but that sounds to me like a terrible idea from a safety perspective so I haven't tried it yet...
My other brake issue is a newly spongy lever following a flight. Do I just need to bleed the brakes? (I've got the shimano 105 hydro set)