9701500010 Max. operating pressure 8.5 bar for evobus,mercedes-benz,paccar pneumatic clutch actuator https://www.zjoubote.com/product/clutch-servo/9701500010-max-operating-pressure-8-5-bar-for-evobus-mercedesbenz-paccar-pneumatic-clutch-actuator.html A clutch servo is a pneumatically-assisted clutch-actuation device, enabling accurate and sensitive clutch use. It dramatically reduced the amount of effort required by the driver when actuating the clutch pedal.