Brake Master Cylinder

In automotive engineering, the master cylinder is a control device that converts non-hydraulic pressure (commonly from a driver’s foot) into hydraulic pressure. This device controls slave cylinders located at the other end of the hydraulic system.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, and they push the brake pads towards a surface that rotates with the wheel (this surface is typically either a drum, or a disc, a.k.a. a rotor) until the stationary brake pad(s) create friction against that rotating surface (typically the rotating surface is metal or ceramic/carbon, for their ability to withstand heat and friction without wearing-down rapidly).