Hayes Dominion A4 Hydraulic disc brake

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.

Technology:

QuickBite² system for fast and consistent burnish, coupled with our D-Series rotor to manage the heat with less braking noise
Low Input - High Fidelity (LoFi) - low effort system with predictable, progressive ramp up and a crisp bite point
Reduced Friction - a featherlight lever feel is acheived through a combination of an added glide ring on the piston and sealed ball bearings at the lever blade pivot
SRL - Stable Rate Link delivers a consistent lever ratio regardless of reach
Precise Engagement - the lowest dead stroke possible and a crisp bite point
Modal Resonance Cancellation (MRC)- minimizes or even eliminates vibrations what leads to less noise. In addition, MRC enables a more constant braking process

Specifications:

Tool-Free Reach Adjustment
Flip-Flop Lever Orientation
King Pin Pad Retention
Crosshair Caliper Alignment
Two-Stroke Dual-port bleed system
Kevlar hose

100 cm Front Hose Length
180 cm Rear Hose Length

310 g (100 cm hose and mount hardware)

Available in SFL (Small Finger Lever) - ergonomically tailored for the smaller hand.

Review: https://www.pinkbike.com/news/review-hayes-dominion-a4-brake.html

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