With a motorsports-inspired Two-Stroke dual port bleed system, industry-leading DOT 5.1 fluid and Kevlar hose, the hydraulic system is engineered for ultimate performance across all temperatures and easy maintenance The Dominion A4 caliper utilizes four pistons in the most structurally rigid design possible Dominion�s master cylinder is factory tuned for the shortest dead stroke possible and a crisp bite point Features a cold-forged caliper and KingPin structural pad retention bolt that increases stiffness Dominion A4 features the proprietary QuickBite? system for fast and consistent burnish, coupled with our D-Series rotor to manage the heat with less braking noise Crosshair Caliper Alignment System dramatically simplifies caliper installment and alignment and allows users to quickly and accurately set brake caliper with no rubbing of the rotor on the pads Cartridge-bearings used in the brake lever for ultra smooth performance Rear No Rotor Black/Bronze Dot 5.1 310g Standard Post Mount