So I changed the master cylinder because the brakes go to the floor with little effort. Install the master cylinder after I bench bleed and after install I bleed with a pressure bleeder. Brake ordeal still goes to the floor. The only odd thing was when I let pressure out of the pressure bleeder a couple bubbles came from the front of the master cylinder into the brake res. The hoses look good but could it be one has a leak? Or is the new master cylinder defective?


1981 Mercedes 300SD