There are two types of clutch linkages:
1. Mechanical Linkage
2. Hydraulic Linkage
The mechanical linkage consists of a clutch pedal, clutch cable and clutch release lever. The clutch cable consists of a flexible casing carrying a flexible wire rope through it. One end of the cable is attached with the clutch pedal and other end is attached to the clutch release lever. When the driver presses the clutch pedal, the clutch cable pulls the release lever, which helps to disengage the clutch.
The hydraulic linkage consists of master and slave cylinders, clutch release bearing and a hydraulic line. The master cylinder consists of a reservoir containing brake fluid. When the driver presses the clutch pedal, the piston of the master cylinder, moves and pushes the brake fluid into the slave cylinder. The slave cylinder is located at the clutch assembly and is linked to the clutch release lever. The pressurized fluid actuates the slave cylinder piston, which in turn operates the clutch release lever and disengages the clutch.
Both the clutch linkages help to maintain contact between the driving and driven members of the clutch. The mechanical linkage requires minimal maintenance, but is less efficient as the cable can stretch, causing slippage. The hydraulic linkage is more efficient and requires less maintenance as it compensates for wear and prevents any kind of slippage.
