Hayes Dominion A2 SFL Disc Brake Lever - Front Hydraulic Post Mount Stealth BLK/GrayHayes Dominion A2 SFL Disc Brake and Lever Front Hydraulic Post Mount Stealth Black Gray. 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 control Dominion A2 features the proprietary QuickBite system for fast and consistent burnish Using a two stroke dual port bleed system and