Hayes Dominion A4 Disc Brake and Lever – Front or Rear, Hydraulic, Post Mount, Purple/Black

The Hayes Dominion A4 Brake, offered in a limited-edition “Purple Hayes” colorway, combines predictable power with a crisp bite point. This performance brake features a low-effort system with progressive ramp-up and a featherlight lever feel, achieved by sealed ball bearings at the lever pivot and a glide ring on the piston.

Its robust design includes a cold-forged caliper with four pistons and a KingPin pad retention bolt for stiffness. The two-stroke dual port bleed system and DOT 5.1 fluid ensure consistent performance across temperatures. D-Series rotors and the QuickBite system work together to manage heat and reduce braking noise.

Quick Facts