Your 1999 Mitsubishi Eclipse is able to change speed because of the presence of the clutch assembly that is attached to its transmission. The clutch assembly has many parts, and one of which is the clutch master cylinder. Hydraulic fluid is needed by the clutch assembly so that it can relay the required change in speed in the transmission. The reservoir of the hydraulic fluid is the clutch master cylinder. In your Eclipse, the mechanical force in the clutch pedal is transformed into hydraulic power by the Mitsubishi Clutch Master Cylinder. There is a ripple effect in the change in power, and all other important parts move synchronously to effectuate change in speed. However, this part will eventually wear out as you change speed everytime you drive. Replace it with the Japan Clutch Master Cylinder for quality that will never be compromised. With the Japan I3000-59280 Clutch Master Cylinder, you are assured of optimum service. There is never a need to look for other products because the clutch master cylinder from Japan will suit the requirements that you need and surely come up with your standard. Get a Japan Clutch Master Cylinder in our web store to avoid higher prices from local shops.