DescriptionShimano XT BR-M8110 Disc Brake Caliper – 2-Piston Rear Only Flat-Mount Metal Pads with Fins Gray. Deore XT BR-M8100 series disc brake calipers offer consistent braking performance and reliable stopping power in all conditions. TECH SPECSBrake Caliper TypeFlat MountBrake PositionRearDefined ColorGrayHydraulic Fluid TypeMineral OilPad CompoundMetallicRotor IncludedNoWeight417