Hayes Dominion A4 Disc Brake Levers

The Dominion four-piston hydraulic disc brake has been developed for the rigors of DH and enduro riding provide. Designed with a specific lever pull curve to balance on-demand pressure modulation providing firm engagement between the pads and rotors optimized for the world’s most demanding conditions and riders.

Low-effort lever input coupled with high-fidelity power output for optimum braking feel and control

Master cylinder is factory tuned for the shortest deadstroke possible and a crisp bite point

Pre-bled and assembled with Hayes K2 Kevlar weave hose: The stiffest hose possible for maximum power and control transmission

Brake includes two specific pad brake pads intentionally developed to be paired with the new D-series rotor for fast consistent burnish predictable friction rate and consistency across temperature and speed conditions

Both pad compounds are included: Semi-Metallic T106 (standard) and Sintered T100 (wet conditions)

D-Series rotors caliper adaptors and bleed kit sold separately

Adjustable Contact Point	Yes
Adjustable Reach	Yes
Brake Caliper Type	Post Mount
Brake Lever Actuation	Hydraulic
Brake Lever Use	Left or Right, Right
Color	Black/Bronze, Black/Gray, Purple/Black
Designed for ebike	Yes
Hydraulic Fluid Type	DOT
Hydraulic Hose Length	1800
Pad Compound	Sintered
Rotor Included	No
Weight	310g, 314, 320g
Model	Dominion A4, Dominion A4 SRL
Kit	Front or Rear, Left/Front, Right/Rear
Caliper	Post Mount 74mm
Rotor	Separate
Fluid	DOT