ok guys I need some help. the X drives great! I love it........but it won't stop!

I bled the lines and there is no air in them. but the front breaks are not grabing anywhere near the full force they should. has anyone had this issue? do I need to replace the Master cylendr? or should I still try to find the air in the lines. it acts like air because you can pump the breaks just like if air was in there.
please help with any info. I needed this thing on the road yesterday. oh well.