A hydraulic system uses pressurized fluid to actuate various components like disc brakes, drum brakes, power steering etc., which are controlled by master cylinders and slave cylinder respectively.  A master cylinder is the component that controls the operation of a vehicle's braking or clutching systems through hydraulic pressure generated from its reservoir (usually located in front wheel well). It converts mechanical energy into fluid power, which then actuates various components like disc/drum brakes and clutches.  The slave cylinder is the component that controls a vehicle's parking or emergency-brake system through hydraulic pressure generated from its reservoir (usually located in rear wheel well). It converts fluid power into mechanical energy, which then actuates various components like disc/drum brakes and clutches.
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