Is the master cylinder part of the 4 6 or 8 ect cylinders of your engine or is it different?

The Master Cylinder is part of your Braking system. It is usually located on the Firewall of your car and holds the brake fluid which allows you to stop by pushing fluid against the caliper on your brakes when you put your foot on the pedal. The cylinders of an engine are usually referred to as combustion chambers, or simply the engine block.