Radial master cylinder for more stopping power and improved control other features are the excellent brake force modulation and an one way bleeding system which allows easy service the opposed 2 piston design for high braking power with minimalistic high rigidity construction the brake can be used with g01s resin g03s metal and f01a resin pads shimano recommends the use of sm rt64 servo wave brake discs but the brake is also compatible with all other shimano centerlock brake discs like t