Brake Issues- Low, spongy pedal

[rseeley]

I recently changed the rotors on my '91. When I turned in the drivers side piston with a C-clamp, it forced fluid out of the top of the master cylinder because I turned it in too fast. Since then, I have very little pedal unless I pump it several times. Even then it doesn't always come back up. It is unsafe to drive.
I bled the brakes, checked the fluid level, and there are no leaks in system.
The only thing I know left to do is replace the master cylinder. Could it have something to do with the rear ABS? I read a post about adjusting the booster rod, would that help?
Any suggestions would be greatly appreciated.
Thanks,
Rob Seeley

 

[jimbo74]

it sounds as if you did not bleed the brakes properly....bleed them again with a friend to help you....

 

[MSTNGGUY88]

Also sounds like to me you didn't bleed them good. Try again.

 

[rseeley]

I've bled them 3 times with no results. It does indeed feel as though they still need bleeding. However, I feel very confident that that is not the problem. I got no air out of the lines, just a nice steady steam of fluid. Any other suggestions?
Thanks,
Rob