BREMBO RCS15 BRAKE Mastercylinder w/ Folding Lever, 110.A263.30. The Brembo 15RCS Master Cylinder is ideal for single caliper braking systems such as those found on supermotos and 250-500cc sportbikes. It features a radial configuration that yields a dramatic increase in stopping power and brake feel over the stock axial master cylinders. The Brembo RCS Brake Master Cylinder allows the rider to choose between more power or more precision to best complement their riding style, track/street conditions and other brake components. The unique design of the RCS system offers the flexibility to change the brake lever ratio at the turn of a screw. The 20mm setting provides a more reactive braking response and the 18mm setting allows for better feel and modulation. Additionally, the Brembo lever features an adjustable thumb screw that can be customized to fit a range of riders' hands. In the event of a crash the outer portion of the lever folds up and away to avoid damage. The patented master cylinder is constructed of forged aluminum and then CNC machined down to remove any excess weight. All of its components, including the piston, seals and pushrod, are the same as those used in MotoGP and WSBK.