Hydraulic concentric slave cylinders combine a number of different functions in a compact unit that can be easily mounted to the gearbox. In order to increase the level of functional integration (e.g: ventilation, vibration damping), LuK makes extensive use of plastic materials in the design. To minimise pedal-force, a new lubricant has been developed especially for application in concentric slave cylinders. This guarantees consistent performance throughout the service life.