brake problems. got air?

[kucke]

So this is my first post and i would just like to say what up to everyone.

Anyway, so I just bought a '05 zx6r with 3k miles on it 3 weeks ago. The front brake lever had a lot of play before it would generate stopping force. I had to pull the lever so far back that i had to use all 4 fingers. So I bleed them and a lot of air was in the system. The lever stiffened back up to normal for about a week. Then it startedgetting worst again. I haven't re-bleed the brakes but i suspect it to be air getting in to the system some how. brake pads and fluids are all fine

i was curious if anyone else has had this problem and what they did to fix it? new lines would probably due the trick but then again it could be the master cylinder. anyone have any insight?

[Shifty1]

May be a master cylinder issue...could be that the seals and rings are bad.

[kucke]

thanks. i re-blead them last night and there was a lot of air again.. i think it is the bleeder valve in the master cyclinder that is not sealing but i will see after i ride around for a little bit today.

is there any trick to seal the bleeder valve better?