Fits 8/1980 – 4/1985 FJ40, FJ45, FJ60 This is a high quality, brand new Clutch Slave Cylinder, not rebuilt. The clutch release cylinder (also known as the clutch slave cylinder) is the component that transfers hydraulic pressure, achieved through the clutch master cylinder, into a mechanical force to control the clutch fork. The force from the release cylinder engages and releases engine power to the transmission.