My pedal goes all the way to the floor with very little resistance, and doesn't begine slowing the car until it gets there. I checked for leaks and couldn't find any (doesn't mean there any there). I changed brake pads, and bled the system with no improvement. After bleeding the brakes, I noticed some kind of "air" noise coming from the front resevoir on the master cylinder, while my friend pumped the brakes. While she pumped the brakes, the fluid level dropped in that resevoir with each pump and she reported a much better feel in the pedal. Once I had her stop, all the fluid that been drawn into the lines came back up into the resevoir. Then of course, the brakes went right back to the floor. I searched for similar problems on here and the 2 I found suggested it may be a faulty master cylinder. So I ordered one from silverminemotors.com. Got here 2 days later and I put it in, hopes high this would fix the issue. No difference at all. I'm stuck as to what it could be. If any of you have a clue, please fill me in. Thanks for your time, its much apprecieated.