Brake Rear Tektro HD-E3940

Tektro HD-E3940 Dorado Quad-Piston Hydraulic Rear Brake

Take control of your stopping power with the Tektro HD-E3940, a premium 4-piston hydraulic brake system engineered specifically for the high-speed and high-torque demands of modern electric bikes.

While standard 2-piston brakes can struggle with the weight of an e-bike, the Dorado’s quad-piston caliper provides massive surface area for consistent, fade-free braking on long descents. This rear-specific assembly comes pre-bled and includes an integrated motor cut-off sensor for a true "plug-and-play" safety upgrade.

Key Features

• Quad-Piston Dominance: Features a forged aluminum 4-piston caliper that delivers explosive stopping power and superior heat dissipation compared to standard systems.
• Integrated Safety Sensor: Equipped with a quick-connect power cut-off sensor (EJ1 cable) that immediately disengages the e-bike motor when you pull the lever.
• Ergonomic 3-Finger Lever: The cast aluminum lever features a comfortable 3-finger blade with an adjustable reach (83–88mm) to fit any hand size.
• Heavy-Duty Construction: Designed to work perfectly with 2.3mm thick rotors, providing a stiffer, more reliable braking feel under heavy loads.
• Easy Maintenance: Uses a universal oil route and non-corrosive mineral oil, making seasonal bleeds and maintenance straightforward.

Technical Specifications

• Model: Tektro HD-E3940 (Rear Assembly)
• Caliper Type: 4-Piston Forged Aluminum
• Hose Length: Approx. 1850mm (Rear specific)
• Brake Pad: Q13RS High-Performance Resin (5mm thickness)
• Fluid: Mineral Oil
• Sensor Type: 2-Pin Quick Connection
• Finish: Durable Anodized Black