Originally Posted by
masonv45
Sounds like you have an air pocket that moved from the master cylinder past the piston to the brake line. Then later moved back into the master cylinder. Either way, a brake bleed is in order.
That is what I was thinking. I have a mountain bike that used to have Avid Jucy's (the technology SRAM purchased for their brakes). I turned the bike upside down to adjust something in a campsite, flipped it back over, and presto -- no brakes! A couple hours later sitting upright, II tried it again, and it was fine.
I ultimately fixed the problem by getting XT brakes.