Close the bleed valve on the slave, pump the clutch pedal, have a helper open the bleed valve while you are holding the clutch to the floor. Close bleed valve, repeat until the fluid pumps out. Make sure the slave stays full with brake fluid.
If that doesn't work bench bleed the master, check the length of the rod that pushes the master that it is the right length. Return master to store for a different on. Check out rockauto.com for parts.
check here: 311s.org Datsun Sports Tech Wiki | TechSection / 311s.org datsun sports tech wiki browse