Help with brakes

I replaced my brake pads with Hawk HPS today. I was bleeding the system and everything seemed fine until I got to the last caliper, the left front. While my wife was pumping the brakes for me, the tubing popped off the bleeder screw. I quickly replaced it but a few pumps later she said the pedal went to the floor a lot easier and lost a lot of resistance. I ended up bleeding the entire system again twice without significant improvement.

I had done everything like I was supposed to. I even opened the bleeder screw as I was compressing the pistons so the fluid wouldn't be forced backwards through the system. My reservoir never ran out of fluid during bleeding.

I was able to get some air bubbles out of the left front bleeder screw, but I started to notice that it would slowly bubble even if the pedal wasn't being pumped. Do I have a bad bleeder screw that's letting air into the system? If I have air in my master cylinder is it hard to get out?

I drove around the block once and have some pressure about an inch before the pedal hits the floor.

Any suggestions would be appreciated.
 
maybe you left the bleeder open. is there any fluid leaking? also maybe you should bleed it again. check fluid level. and how did you back out the rear caliper pistons? not with a c-clamp i hope. BTW do your hawks squeal? because mine squeal a lot