Clutch master cylinder is a control device that converts non-hydraulic pressure into hydraulic pressure. This device controls slave cylinders located at the other end of the hydraulic system. The piston moves along the bore of the master cylinder, this movement is transferred through the hydraulic fluid, to result in a movement of the slave cylinder.
The most common vehicle uses of master cylinders are in brake and clutch systems. In brake systems, the operated devices are cylinders inside of brake calipers and/ or drum brakes. These cylinders may be called wheel cylinders or slave cylinders.
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Clutch slave cylinder
Applies pressure from the clutch pedal to the clutch "slave" cylinder. It looks much like the master cylinder, but is much smaller, and is located on the firewall, under the hood, directly in front of the driver.