Hayes Dominion A4 Disc Brake Lever
Best high performance brake upgrade for aggressive mountain bike enthusiasts.
Engineered for the rigors of gravity riding, this four-piston hydraulic system delivers exceptional stopping power and modulation. The low-effort lever design ensures precise control, while the reinforced hose construction maximizes power transmission for consistent performance in demanding conditions.
$249.99
at
Airpark Bike Co
More Dominion options
Who it's for
- Enduro riders seeking maximum control with minimal finger effort
- Technical mountain bikers who prioritize fine-tuned speed control
- Performance-oriented cyclists who frequently fine-tune their cockpit setup
Who should skip it
- Home mechanics who prefer simple, one-way maintenance procedures
- Weight-conscious racers looking to build the lightest possible bike
- Remote travelers who need widely available replacement components
Performance breakdown
Stopping Power
Four-piston architecture delivers immense, reliable force for the steepest descents.
Lever Modulation
Exceptional feedback allows for nuanced, precise braking control on technical terrain.
Heat Management
DOT 5.1 fluid and specialized pads resist fade during long, aggressive runs.
Hose Stiffness
Kevlar-woven lines eliminate sponginess for a direct, immediate connection to calipers.
Ergonomic Feel
Low-effort lever throw reduces hand fatigue during extended, high-intensity riding sessions.
Build Robustness
Heavy-duty construction withstands the harsh impacts typical of downhill racing environments.
Key Specs
Weight
320 grams
Brake Type
Hydraulic Disc
Intended Use
Downhill, Enduro
Brake Fluid Type
DOT 5.1
Mounting Standard
74mm Post Mount
Color
Purple/Black
Brake System Type
Hydraulic
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