Hayes Dominion A4 Disc Brake Lever

The Dominion A4 is engineered specifically for aggressive gravity riding, including downhill and enduro disciplines. Its four-piston design is built to handle the heat and sustained braking forces required on steep, technical terrain.

Yes, the Dominion A4 uses DOT 5.1 brake fluid. It is important to use the recommended fluid to maintain the system's performance and seal integrity under high-heat conditions.

The A4 is designed for low-effort lever input, which provides a very light, responsive feel at the finger. This allows for precise modulation, meaning you can control your speed more accurately without needing to squeeze the lever excessively hard.

The calipers use a standard 74mm post mount, which is compatible with most modern mountain bike frames and forks designed for disc brakes. You should verify your frame's mounting standard and rotor size compatibility before installation.

The Kevlar-woven hose is designed to resist expansion under high pressure. This ensures that the force you apply at the lever is transferred directly to the caliper, resulting in a firmer, more consistent lever feel during hard braking.

QuickBite2 is a specialized pad compound developed by Hayes to provide consistent, predictable stopping power across a wide range of temperatures. They are designed to bed in quickly and offer reliable performance right from the start of your ride.