Is your clutch release not working as well as you'd like it to? Are you a slave to your worn out cylinders? Get control with a replacement master or slave clutch cylinder. Replacing the slave cylinder is a good idea when you are performing a clutch job. With a relatively low cost, the insurance of replacing it when you're performing a big clutch job is well worth the cost. The way a hydraulic clutch works is quite simple to understand. When you push the clutch pedal, it sends fluid from the clutch master cylinder down a hose to the clutch slave cylinder, which is mounted on the transmission. The fluid, which is under pressure, forces the clutch cylinder to push out a rod, which is connected mechanically to the release fork. When the rod moves, it also moves the release fork, disengaging the clutch, and allowing you to shift. Also be sure to purge the system of air bubbles at the same time.