and disengage an associated automated engine clutch and an automated friction clutch for example an automated engine clutch arranged in the drivetrain of a motor vehicle between a drive engine and a transmission with a controllable actuating drive provided as the clutch actuator for engaging and disengaging the friction clutch to improve the controllability and achieve a longer service life while reducing production costs it is proposed to use as the actuating drive a pneumatic muscle with a hose body made of a fluidically impermeable and elastic material with a lattice network of tension resistant fibers arranged in the outer area on the hose body and with end pieces that close off the hose body axially at its ends application_number US 8911206 A description a clutch actuator mechanism 1 represented in fig1 a and 1b for a single disk dry clutch with membrane spring not shown in more detail comprises a release lever 2 mounted at one end to pivot on a pivot bearing 3 fixed to a housing engaged approximately in the middle by way of two carrier bolts 4 arranged radially opposite one another with a release bearing 6 mounted to move axially on a guide sleeve 5 fixed to the housing and connected at its other end to a clutch actuator 7 the clutch actuator.