Ok I have a Saturn ION and the brake pedal goes almost to the floor. I started off by bleeding the brakes and that didn't work so I changed the master cylinder and that didn't work so what's next? There are no leaks that I can see. Do you think it might be the booster? I mean there's not much left

 

Could have a bad hose. Could have a bleed that didn't work. How did you bleed them? Master bled before install?

 

Make sure the hose to the brake booster check valve hasn't come loose or split. If it looks okay, maybe replace the check valve.