GM Service Manual Online
For 1990-2009 cars only

The clutch release system consist of a combined clutch master cylinder , reservoir, switch, and actuator cylinder connected to the hydraulic tubing.

When the clutch pedal is depressed, the clutch master cylinder push rod is forced into the clutch master cylinder causing the clutch master cylinder to become pressurized. Hydraulic fluid is then forced down the hydraulic tubing from the clutch master cylinder to the concentric slave cylinder. When the hydraulic fluid is pushed into the slave cylinder, the slave cylinder engages by pushing the release bearing into the diaphragm spring and releasing the clutch.

The clutch master cylinder is positioned through the cowl panel. The hydraulic tubing is routed from the Clutch master cylinder to the concentric slave cylinder via a quick connect coupling. The concentric slave cylinder is located inside the transmission on the transmission input bearing retainer.

Replacement of the hydraulic control system is made easier because the hydraulic tubing connecting the slave cylinder to the master cylinder can be removed from the slave cylinder by engaging the quick connect coupling mounted through the transmission housing. This allows replacement of the hydraulic line, master cylinder, and pushrod assembly with out having to gain access into the transmission clutch housing.

A two function switch, located on the push rod, is used as a clutch interlock to ensure the engine can not be started unless the clutch pedal is engaged (positioned to the floor). a second function of the switch is to cut off the cruise control system (if the vehicle is so equipped) when the clutch pedal is engaged.

The hydraulic clutch system provides automatic clutch adjustment. No clutch pedal free-travel adjustment is required.