Master Cylinder - LHD: Operation

WARNING: This page is about a different car, the 2006 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Clutch Hydraulic System - LHD

Courtesy of DAIMLERCHRYSLER CORP.

1 - BRAKE MASTER CYLINDER RESERVOIR

2 - CLUTCH MASTER CYLINDER

3 - ADJUSTMENT SCREW

When the clutch pedal is depressed, the push rod moves the piston in the master cylinder (2), displacing fluid through the hydraulic line and into the slave cylinder. As the slave cylinder extends, (actuating the clutch release lever on the 1.6L & 2.4L only), the release bearing is forced into the fingers of the clutch diaphragm springs. As the fingers move, they release the clamping pressure on the clutch disc between the clutch pressure plate and the flywheel. The clutch becomes disengaged as this pressure is released. See Fig 1.

When the clutch pedal is released, the system hydraulic pressure is released. This allows the force of the clutch diaphragm springs to return to their original position, re-clamping the clutch disc between the flywheel and the clutch pressure plate. Also, the release bearing and lever are forced to return, which reverses the movement of the hydraulic system and returns the pedal to its original position against the up-stop.