The Hayes Dominion A4 Disc Brake Caliper is a high-performance hydraulic brake caliper engineered to deliver strong, controlled stopping power and excellent modulation for aggressive trail, enduro, and all-mountain riding. Part of the acclaimed Dominion A4 brake family, this caliper is designed to pair with Hayes’ Dominion A4 master cylinders and lever systems for a premium braking experience.

Built with durable, precision-machined components and a four-piston configuration, the caliper provides balanced clamping force and consistent pad engagement across a variety of conditions. Its robust construction and thoughtful sealing help resist contamination and heat, ensuring dependable performance ride after ride. With excellent modulation and power, the Dominion A4 caliper gives riders confidence when descending steep terrain or navigating technical trails.

Key Features:

• Genuine Hayes hydraulic disc brake caliper
• Four-piston design for powerful, balanced braking
• Excellent modulation and heat resistance
• Durable construction for demanding trail use
• Compatible upgrade if running Hayes A2 setup