My name is Rob and I have a 2000 Cadillac Seville STS. My master cylinder went when I had a ruptured brake line. I replaced the brake line and master cylinder(bench blead) and blead all the air out of the line. The pedal still goes down to the floor. I figured the new master cylinder may have been a dud so I took it back and put another new one on and the same thing happened. I also gravity bleed the system. If you think you may have an answer Please respond when you can.

If your pedal still goes to the floor you have more bleeding to do. You must get 100% of the air out of the system to make it right.

Don