Designed for E-bikes: This brake system features an automatic power-off sensor and is compatible with 3-pin connectors. When you brake, the power output is instantly cut off, ensuring fast and efficient braking. Powerful Braking Force: Enjoy rapid braking performance with dual pistons in each caliper, delivering robust stopping power on every ride. Pre-bled with eco-friendly mineral oil, it?s ready to use right out of the box?no bleeding required. Enhanced Riding Safety: The semi-metallic brake pads are pre-installed, offering the low noise benefits of resin pads combined with the durability of metal pads for a quiet yet reliable performance. Hose Length and Caliper Compatibility: The front brake hose measures 950mm (37.4in), while the rear hose is 1850mm (72.8in). Please note that the caliper can only be mounted on the left side of the wheel.