Tektro

HD-E3120 E-Bike Disc Brake

Tektro HD-E3120 E-Bike Disc Brake delivers a purpose-built hydraulic disc brake setup for e-bike use, pairing consistent stopping power with an integrated motor cut-off signal for cleaner, more controlled braking on assisted bikes. A 2-piston caliper provides predictable modulation for everyday commuting, cargo, and mixed-surface riding where reliability matters as much as power.

Built around service-friendly details—including a one-piece clamp and a new reservoir cap—the HD-E3120 is a practical upgrade or replacement for riders who want straightforward installation, dependable lever feel, and e-bike specific safety integration.

Brake system details that matter on e-bikes

• Quick connection power cut-off sensor - Sends a brake signal to cut motor power under braking; includes New EJ1 200mm sensor cable for e-bike wiring integration
• 2-piston hydraulic caliper - Balanced power and controllable modulation for repeatable stops in real-world conditions
• One-piece clamp - Clean, secure bar mounting for stable lever positioning
• 85mm lever reach specification - Helps dial in cockpit ergonomics and lever access based on the listed reach dimension
• 1.8mm rotor thickness specification - Built around a 1.8mm rotor standard for correct pad/rotor fit per the listed rotor thickness

E-bike compatibility: Includes a Tektro EJ1 quick-connect motor cutoff sensor with a 200mm cable. Designed for e-bike systems compatible with the Tektro EJ1 connection. If replacing a brake from another manufacturer, verify that the connector and electrical signal are compatible with your e-bike system.