Since model year 1986, some of the models have hydraulic clutch release system installed which consists of the clutch pedal, master cylinder, fluid reservoir, hydraulic line, slave cylinder and clutch release bearing. The initial checks of the diagnosis of clutch system failure should monitor the fluid level in the master cylinder and leaks. To have full release of the clutch, travel of the release cylinder push-rod must be adjusted to have the pedal fully depressed. The height of the clutch pedal can be altered by using a distance between the pad of the pedal to the floor and changing the stopper bolt when needed. The height of free-play and disengagement should also be measured and adjusted by adjusting the push-rod to the master cylinder. To remove and install the clutch master cylinder, make sure you detach the negative battery cable, and remove the hydraulic line in a painstaking manner in order to prevent spillage of fluids. Once the master cylinder is firmly fixed, the hydraulic line is to be re-attached, and the system drained with DOT 3 brake fluid. Equally, in case of the release cylinder, the negative battery cable must be disconnected and the vehicle lifted off and the hydraulic line taken out, then the new cylinder should be installed and the hydraulic line reattached. It is necessary to bleed the hydraulic system, to make sure that the master cylinder contains new DOT 3 fluid, and it is performed with the help of a hose attached to bleeder valve when an assistant presses the clutch pedal. Once the system is checked to make sure that all air is removed and working properly, then the vehicle may be lowered back into service.