Smart Fortwo Cabrio City-Coupe Clutch Actuator Slave Cylinder 3981000070Feature: 1. The clutch driven cylinder actuator uses enhanced high quality materials, which are wear resistant, corrosion resistant, long service life and high sensitivity 2. It works with the clutch master cylinder to disconnect the clutch when pressing the pedal, so that the transmission can move safely 3. this is an OEM replacement part to directly replace your clutch slave cylinder actuator. The clutch actuator is a part of the whole clutch system