Hayes Dominion A4 Rear Brake

The Hayes Dominion A4 rear brake is designed for riders who demand uncompromising braking power with a refined feel. Built to meet the highest standards, the Dominion A4 combines innovative engineering with cutting-edge materials to deliver the ultimate riding experience. Its factory-tuned dominion's master cylinder ensures the shortest dead stroke and a precise crisp bite point, giving riders unparalleled control.

Engineered with a cold-forged caliper and four pistons, the Dominion A4 boasts the most structurally rigid design to handle intense riding conditions. Whether you're tackling steep descents or technical trails, this hydraulic system delivers consistent, reliable performance.

Key Features of the Dominion A4 Disc Brake

• Factory-Tuned Master Cylinder: Adjusted for the shortest dead stroke and sharp bite point straight out of the box.
• Cold-Forged Caliper: Designed for maximum stiffness, enhancing braking performance.
• Kevlar Hose: Provides durability and stability under extreme pressure, ensuring smooth operation.
• Tool-Free Reach Adjustment: Customize lever distance without needing additional tools.
• Two-Port Bleed System: Inspired by motorsports, this design allows for easy maintenance and efficient fluid replacement.
• DOT 5.1 Fluid: Handles extreme temperatures, maintaining consistent braking performance.
• Semi-Metallic Brake Pads: Included for enhanced modulation and less braking noise.
• Structural Pad Retention Bolt: Enhances the system's integrity while improving consistent burnish.

⚠️ Compatibility Note: The Hayes rear brakes are designed to be mounted on the right of the handlebar, it is possible to change the direction in order to have the rear brake lever on the left of the handlebar and thus be identical to the Sur-Ron / Talaria (this modification extends the shipping time by 48 hours on working days).

Specifications

• Brake Type: Hydraulic disc brake
• Caliper: Cold-forged, 4-piston design
• Hose Length: 180 cm, suitable for rear mounting
• Weight: 310 grams
• Brake Pads: Includes both semi-metallic and metallic pads
• Pivot Bearings: Sealed cartridge design for smoother lever action
• Compatibility: Designed for right-handlebar mounting; can be reversed for left-side use to match Sur-Ron or Talaria setups.

Why Choose Hayes Dominion A4?

The Hayes Dominion A4 rear brake is a rider's essential, offering unmatched performance in all conditions. Its fea-optimized modal shapes and structurally rigid design ensure powerful, consistent braking while minimizing noise. The system is built for both cross-country enthusiasts and downhill riders, making it one of the most versatile brakes on the market.

Whether you're an enduro adventurer or a daily trail rider, the Dominion A4 hydraulic rear brake guarantees smooth modulation, easy setup, and ultimate performance. Its advanced design enables a fast and consistent burnish process, so your brakes perform optimally right from the start.