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You are searching for Brake Master Cylinder

In automotive engineering, the Master cylinder is a control device that convertsnon-hydraulic pressure (commonly from a driver's foot) into hydraulic pressure. This devicecontrols Slave cylinders located at the other end of the hydraulic system.

As piston(s) move along the bore ofthe master cylinder, this movement is transferred through the hydraulic fluid, to result in amovement of the slave cylinder(s). The hydraulic pressure created by moving apiston (inside the bore of the master cylinder) toward the slave cylinder(s)compresses the fluid evenly, but by varying the comparative surface-area of themaster cylinder and/or each slave cylinder, one can vary the amount of force and displacement applied to each slavecylinder, relative to the amount of force and displacement applied to themaster cylinder