So weird thing happened today. Old slave cylinder was leaking a good bit, got a new Aisin and the rod was too short, so using original rod that came with my ‘81 43. Bled the system by gravity, bleeding nipple on the top. But pedal needs 2 pumps to fully actuate. Had some help to pressure bleed it, no air in system, but still that first pedal just goes to the floor. Second works perfect. Any ideas? System is so simple....