Brembo RCS R19 radial master cylinder with adjustable pivot distance of 18 or 20 mm. These master cylinders provide outstanding feedback and control for the ultimate in sport bike safety and performance. Adjustable master cylinder is sized for operating twin 4 piston 30/32 brake calipers as found on Moto Guzzi and Ducati motorcycles since the 1990s. The RCS system consists of an adjuster that sets the brake lever pivot distance to either 18 or 20 mm, to provide perfect feedback between rider and machine. Setting the pivot distance to 20 mm makes the braking system more reactive and immediate, while a pivot distance of 18 mm makes it more precisely controllable, so you can choose your prefered setup depending on road and weather conditions and your own perception. Includes brake light switch and folding brake lever, hard anodised Â•body, compatible with DOT 4 brake fluidÂ•, and has a standard M10 x 1.00 threaded connection for brake hose fitting.