In modern cars, the force applied to the pedal, within the clutch system, is transmitted by hydraulic systems and no longer by mechanical systems.

The concentric slave cylinder combines the functions of the thrust bearing and slave cylinder in one unit. In this way, the release fork between the bearing and the secondary cylinder is eliminated. The clutch is then operated directly by the concentric actuator, which performs the functions of the slave cylinder and thrust bearing.

The concentric slave cylinder - often referred to simply as CSC - is positioned directly in the bell­ housing outside the gearbox shaft. The system works without running clearances and is self-adjusting, thereby maintaining the system's constant functionality throughout the operating life of the clutch plate. The CSC must be changed each time the clutch plate is replaced.

Nowadays, the car buyers have great demands when it comes to performance and comfort. The number of additional components in contemporary engines has grown considerably and the need to optimise space means that components that can perform multiple functions simultaneously must  be chosen. This is why, to date, more than 50% of new cars are equipped with a concentric slave cylinder.

lts structure offers numerous advantages: 

· Compact design

· Long life

· Less weight due to fewer components 

· Greater protection against external agents 

· Less force to be applied on the clutch pedal 

· Self-adjusting

· Greater heat resistance