Review on EXEDY MC229 Clutch Master Cylinder: Reliable Performance and Smooth Shifting by Justin Hill

I installed a master and slave unit last weekend and the symptom I was having seems to have been resolved. After about half an hour of driving, it became very difficult to change gears. I've read several reviews and other information on the Miata forums here. Another clue was that the liquid had turned very dark. I am very happy with the installation of these two items and hope they last. The master was my original for 90 years, it lasted 27 years!