Check the listing for details. Hope EVO GR4 Hydraulic Disc Brake Set 4-Piston Post Mount, Left & Right Hand,. Condition: New. Listed at 566.57 USD. Enhance Your Gravity and E-Bike Performance with the Hope EVO GR4 Disc Brake and Lever Set Left and Right Hand, Post Mount, 4-Piston Hydraulic Brakes, Silver/Blue Upgrade your downhill, gravity, or e-bike setup with this high-performance Hope EVO GR4 Disc Brake and Lever Set, available in both left and right hand configurations. Designed for demanding riders seeking maximum stopping power and excellent modulation, this premium hydraulic brake system seamlessly combines advanced materials, innovative engineering, and superior components to deliver precise control in all riding conditions. Key Features & Benefits: - **High-Performance 4-Piston Hydraulic Disc Brake:** Engineered with larger pistons and a one-piece caliper design for increased power and enhanced stiffness-to-weight ratio,.