Hayes Dominion A4 SFL Disc Brake and Lever - Rear Hydraulic Post Mount Stealth Black/Gray. 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 controlPre-bled and assembled with Hayes K2 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 separatelyWe highly recommend using Hayes brake adapters because the oversized calipers can cause compatibility issues with non-Hayes brake adapters.Replacement brake pads can be found here!Get the perfect bleed using the Hayes Pro Bleed Kit