I just got a 2003 so I haven't had to change the brakes on a honda yet. but I just did my girl's jetta and it turns out you need a tool like a big wrench to screw the piston back in. I never had to do that On my old volvo or miata so it stumped for a bit. maybe that's what you needed to do?
-w
ps-the only other problem I had with brakes is when my fiend and I did our first stereo install on his saab 9000 (age 17~18). we couldn't find a grommet so we drilled a hole and ended up puncturing his brake booster. it behaved exactly like you described, but obviously it couldn't be that.
I bet it would do the same thing though if you had drained your masta cylinder while bleeding though. give it a quick level check.