I bought and installed four of the same wheel cylinder for the rear since they all had the same part number and just noticed that one of the old ones from each side seams to have a permanent plug. Ideas?
Buy a short piece of double flared brake line that will fit the wheel cylinder, cut both ends off, and crimp and silver solder the tubing stub closed. Install them in one of the ports on each cylinder. Use the single input cylinder on top so the air can purge itself during bleeding.