Hayes Dominion A2 Disc Brake

The Dominion A2 is designed specifically for cross-country and trail riding. Its two-piston design focuses on a balance of weight and modulation, making it ideal for riders who prioritize precision and control over the raw, heavy-duty stopping power of a four-piston downhill brake.

Hayes uses a system called Crosshair alignment, which features small set screws on the caliper. This allows you to fine-tune the caliper position precisely over the rotor without the brake shifting while you tighten the mounting bolts, making setup significantly easier than standard systems.

The A2 uses a dual-port bleed system, which is designed to make the bleeding process straightforward and thorough. It uses DOT fluid, so you will need to follow standard hydraulic brake maintenance intervals to ensure consistent lever feel and performance.

Yes, the Dominion A2 features both reach and contact point adjustments. This allows you to customize exactly where the lever sits in relation to the handlebar and how much pull is required before the pads engage the rotor.

QuickBite² is a proprietary pad polishing technology that ensures the brake pads are ready for consistent, reliable stopping power right out of the box. It eliminates the need for an extensive, lengthy break-in period before you can trust the brakes on technical terrain.

The Dominion A2 uses a Kevlar-reinforced hose designed to maintain consistent pressure and performance across a wide range of temperatures. This prevents the hose from expanding under heat or stiffening in the cold, ensuring your lever feel remains predictable.