A clutch slave cylinder in a car is a device that aids in clutch disengagement. It plays an important role in the operation of the manual transmission. Hence, the clutch will malfunction, if the slave cylinder is defective. A sick slave cylinder prevents the car from properly shifting gears. There are several symptoms that are indicative of a vehicle’s slave cylinder problem. You have to be aware of those symptoms, so that you can get rid of the issue timely. Consult a car professional for inspection and replacement.