The Dominion four-piston hydraulic disc brake has been developed for the rigors of DH and enduro riding provide. Designed with a specific lever pull curve to balance on-demand pressure modulation, providing firm engagement between the pads and rotors, optimized for the world's most demanding conditions and riders.Low-effort lever input, coupled with high-fidelity power output for optimum braking feel and control Master cylinder is factory tuned for the shortest deadstroke possible and a crisp bite pointPre-bled and assembled with Hayes K2 Kevlar weave hose: The stiffest hose possible for maximum power and control transmissionBrake includes two specific pad brake pads, intentionally developed to be paired with the new D-series rotor for fast, consistent burnish, predictable friction rate, and consistency across temperature and speed conditionsBoth pad compounds are included: Semi-Metallic T106 (standard) and Sintered T100 (wet conditions)D-Series rotors, caliper adaptors and bleed kit sold separatelyItem SpecificationsAdjustable Contact PointYesAdjustable ReachYesBrake Caliper TypePost MountBrake Lever ActuationHydraulicBrake Lever UseLeft or RightColorBlack/GrayDesigned for ebikeYesHydraulic Fluid TypeDOTHydraulic Hose Length1800Pad CompoundSinteredRotor IncludedNoWeight314 Hayes Dominion A4 Disc Brake Disc Brake & Lever UPC: 847863028785