Hayes Dominion A2 Disc Brake and Lever - Hydraulic, Post Mount, Black/Bronze - The Hayes Dominion A2 is optimized for cross country and trail riding, with a compact 2-piston caliper and a short finger lever (SFL). Low-effort lever input, coupled with high-fidelity power output for optimum braking feel and controlDominion A2 features the proprietary QuickBite^2 system for fast and consistent burnishUsing a two-stroke dual port bleed system and Kevlar hose, the hydraulic system is engineered for ultimate performance across all temperatures and easy maintenanceThe Crosshair Caliper Alignment System dramatically simplifies caliper installment and alignmentD-Series rotors, caliper adaptors and bleed kit sold separately