{"product_id":"tektro-hd-e3940-e-bike-4-piston-hydraulic-disc-brake-set","title":"Tektro Super73 HD-E3940 E-bike Power Control 4 pistons Hydraulic Brake 2Pin-OE,No Retail Box","description":"\u003ch1\u003eTEKTRO HD-E3940 E-Bike 4-Piston Hydraulic Disc Brake Set - OEM Bulk\u003c\/h1\u003e\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e TEKTRO\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e HD-E3940\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e E-Bike 4-Piston Open System Hydraulic Disc Brake\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaliper Architecture:\u003c\/strong\u003e 4-Piston Forged Aluminum Caliper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLever Design:\u003c\/strong\u003e Ergonomic 3-Finger Cast Aluminum Lever Blade with Integrated Reed Sensor Switch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Switch Connection:\u003c\/strong\u003e Integrated Electronic Motor Power Cut-Off Cable (Standard E-Bike Connection)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluid Type:\u003c\/strong\u003e Tektro High-Performance Non-Corrosive Mineral Oil\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount Standard:\u003c\/strong\u003e Post Mount (74mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Matte Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePad Compatibility:\u003c\/strong\u003e Tektro High-Performance Metal Ceramic \/ Resin Pads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e 100% Authentic Brand New\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackaging:\u003c\/strong\u003e OEM Bulk (Protective Polybag)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy Choose Tektro HD-E3940 E-Bike Brakes?\u003c\/h2\u003e\n\u003ch3\u003e1. High-Torque 4-Piston Stopping Leverage\u003c\/h3\u003e\n\u003cp\u003eFour-piston caliper construction dramatically increases pad contact area and clamping force compared to standard 2-piston brakes, ensuring short stopping distances for heavy e-bikes and cargo setups.\u003c\/p\u003e\n\u003ch3\u003e2. Integrated E-Bike Motor Safety Cut-Off\u003c\/h3\u003e\n\u003cp\u003eEach lever is equipped with a factory-installed electronic sensor cable that immediately cuts motor power when the brake lever is engaged, preventing motor drag and extending brake pad life.\u003c\/p\u003e\n\u003ch3\u003e3. Superior Heat Dissipation \u0026amp; Modulation\u003c\/h3\u003e\n\u003cp\u003eThe open hydraulic system and high-capacity caliper volume efficiently dissipate heat during heavy, continuous braking—eliminating lever fade and pad glazing on long downhill rides.\u003c\/p\u003e\n\u003ch2\u003eCompatibility \u0026amp; Installation Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Wiring:\u003c\/strong\u003e Compatible with most standard e-bike motor controllers requiring sensor-based motor cut-off (check connector pin type on your controller).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRotor Compatibility:\u003c\/strong\u003e Compatible with 160mm, 180mm, and 203mm rotors (rotors and post-mount adapters sold separately).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBleeding \u0026amp; Maintenance:\u003c\/strong\u003e Uses non-corrosive mineral oil for easy maintenance and environmentally safe servicing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFrequently Asked Questions (FAQ)\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this brake set include motor cut-off sensor cables?\u003c\/strong\u003e\u003cbr\u003eA: Yes! The levers feature integrated electronic power cut-off sensor cables designed specifically for e-bike motor controllers.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this a 2-piston or 4-piston brake system?\u003c\/strong\u003e\u003cbr\u003eA: The HD-E3940 is a heavy-duty 4-piston hydraulic system built for higher stopping demands on e-bikes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this authentic Tektro?\u003c\/strong\u003e\u003cbr\u003eA: Yes, 100% genuine Tektro factory components sourced directly through authorized OEM supply channels.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is OEM bulk packaging?\u003c\/strong\u003e\u003cbr\u003eA: Items ship in industrial protective polybags instead of retail display boxes to pass direct savings to you.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Fast Domestic Shipping?\u003c\/strong\u003e\u003cbr\u003eA: Yes, all orders ship directly from our US warehouse for quick delivery.\u003c\/p\u003e","brand":"Tektro","offers":[{"title":"Default Title","offer_id":52756001620268,"sku":"MK220-US","price":143.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0944\/3357\/5212\/files\/Tektro_HD-E3940_E-Bike_4-Piston_Hydraulic_Disc_Brake_Set_with_Sensor_Cables.jpg?v=1787732900","url":"https:\/\/yanzocycling.com\/products\/tektro-hd-e3940-e-bike-4-piston-hydraulic-disc-brake-set","provider":"YanzoCycling","version":"1.0","type":"link"}