Have a look under the bell housing for any fluid leakage If it is there, it will be the slave. Also check under the clutch pedal. If it is there, it will be the master. You could try topping up the master (remove the lid using a long flat screwdriver to tap it round. Remove the rubber insert from the master and top up the clutch fluid using a syringe or similar. Bleed it under the bonnet if necessary and see how it goes. The DMF's rarely need replacing on the 75's unless you are viscious with the left and right feet!
