Along with new car manufacturers’ requirements, it has become difficult to fit a cable in a straight line between the pedal and the lever. That’s why more and more cars are now using hydraulic systems. These are much more flexible and reliable compared to cable systems. First, they enable an optimal and constant pedal effort. Second, the used material is much lighter (up to 70% reduction of weight compared to the standard clutch system command) as well as being more compact. This is the main reason why this technology is easier to implement on OE projects. In response to this market trend, Valeo has developed a wide range of hydraulic parts: clutch master cylinder (CMC), clutch release cylinder (CRC) and clutch slave cylinder (CSC). Both the clutch master cylinder and the clutch release cylinder are used in the “semi-hydraulic” system, whereas a “full hydraulic” system uses a CMC and a clutch slave cylinder. The CSC is a hydraulic cylinder with an integrated release bearing which eliminates the clutch lever and the conventional release bearing. It is connected to the master cylinder via the hose. The CSC is in direct contact with the clutch cover diaphragm, increasing the efficiency of the hydraulic system. Advantage of the CSC is to eliminate the fork and the release bearing. There are no more deformations of the fork under load and the release system efficiency is increased. Therefore the pedal load is reduced.