• Dominion A4

Dominion A4

Making power is easy. Making power with the right feel, that was our challenge. We did this by creating an all-new system.

Dominion’s master cylinder is factory tuned for the shortest dead stroke possible and a crisp bite point. The Dominion A4 caliper utilizes four pistons in the most structurally rigid design possible. It features a cold-forged caliper and KingPin structural pad retention bolt that increases stiffness.

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.

Dominion A4 features the proprietary QuickBite² system for fast and consistent burnish, coupled with our D-Series rotor to manage the heat with less braking noise.

“The Dominion brake is a winner in every sense, and it had to be if Hayes was going to get another chance at redemption. Throwing out convention and starting from scratch must have been a tough choice for a brake maker that has been in the game longer than anyone else, but it proved to be the right decision. If you are in search of a good brake, start with this one.”  –Richard Cunningham, Pinkbike

“Hayes Brake Bounces Back with the Dominion A4”   –Shawn Spomer, Vital MTB

“As with many motorcycle brakes, the [Two Stroke] system should guarantee perfect bleed results.”  –Mortiz Dittmar Enduro MTB

MASTER CYLINDER: LoFi (Low input / High Fidelity) – Speaks to the overall system feel. Master cylinder dead stroke tech / cam profile / feel
  • Cartridge-bearings used in the brake lever
  • Aluminum piston operates smoothly across operating temperatures
  • Piston glide ring - technology pioneered in suspension forks
CALIPER: Two Stroke – Dual caliper bleed ports for maximum bleed integrity

KingPin – Structural caliper pad pin

Crosshair Caliper Alignment System – Dramatically simplifies caliper installment and alignment

  • Patented Crosshair caliper alignment screws
  • Allows mechanics and end users to quickly and accurately set brake caliper with no rubbing of the rotor on the pads
  • Eliminates guesswork and trial and error
  • Makes set up process quick and easy for ‘out of the box’ build
D-SERIES ROTOR: MRC (Modal Resonance Cancelation) – Rotor harmonic design
  • All objects have a resonant frequency
  • The FEA-optimized modal shapes of D-Series rotors is intentionally designed to oppose that of Semi-Met T106 and Sintered T100 pads; this cancels out noise and vibration translating into more consistent braking
  • 1.95mm material thickness enhances heat dissipation
QuickBite² – Offers riders the shortest path to high performance
  • Fast, consistent burnish
  • Predictable performance
  • Quiet
SERVICE VIDEOS

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$229.99

Suggested retail price Find at your local dealer
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Specs

Weight
310g (90cm hose and mount hardware)
Pad Material
T106 Semi-Metallic (Included), T100 Sintered Metallic (Included)
Rotor
D-series (180, 203) w/ QuickBite² and MRC
Reach Adjust
Tool Free
Pad Contact Adjust
Tooled
Lever Pivot
Sealed Cartridge Bearings
Pad Retention
King Pin
Bleed
2-Stroke Dual Port Bleed System
Fluid
Hayes DOT 5.1
Graphics
Laser Etch
Alignment
Crosshair

Support

Documents

Dominion A4 Hydraulic Brake: Service & Bleed Guide (EN)
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Dominion A4 Hydraulic Brake: Installation & Setup (FR)
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Dominion A4 Hydraulic Brake: Installation & Setup (ES)
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Dominion A4 Hydraulic Brake: Installation & Setup (EN)
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Dominion A4 Hydraulic Brake: Installation & Setup (DE)
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Questions?

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