Help please. I replaced my single pot master with a dual reservoir one from a 67. Couldn't get the brakes to bleed with a vacuum so I had my daughter help me pump. That seem to work good bleed with no bubbles. Went to try and back the car out of the drive way and had very little braking with the pedal mashed all the way to the floor. Pedal was not that firm but rather soft. Went to go check for leaks since ì replaced all the brake lines and saw that the master was leaking from the back where it mounts to the firewall.