The hydraulic clutch release systems are based on the same principle as hydraulic brakes. The hydraulic system consists of a transmitter (clutch master cylinder) a hose and a receiver. The clutch master cylinder is connected to a plastic or a metal tank filled with hydraulic fluid. The tank is either common between the clutch and the brake master cylinders or separate.The receiver, depending on the application, can be a clutch release cylinder (semi-hydraulic system) or a concentric slave cylinder (full hydraulic system).
The mechanical clutch release system consists of a release bearing that is operated by a fork. The fork is attached to a clutch cable operated by the driver’s foot via the clutch pedal. Cars have become lighter and more compact. Car manufacturers demand reduced pedal load linked to comfort reason.
Hydraulic systems become mandatory in such cases as they also provide benefits compared to the manual system, increasing efficiency of the actuation with less space required. For these reasons, one vehicle out of two is equipped with a hydraulic system today.
Benefits of hydraulic technology:
- more flexible and reliable compared to cable systems
- enable an optimal and constant pedal effort
- used material is much lighter -up to 70% reduction of weight compared to the standard clutch system command - as well as much more compact.
The hydraulic systems benefits lead the car markers to implement that technology on OE projects - one vehicle out of two is equipped with a hydraulic system today.