{"product_id":"tektro-hd-e3940-e-bike-power-control-4-pistons-hydraulic-brake-electric-2pin-set","title":"Tektro HD-E3940 E-bike Power Control 4 pistons Hydraulic Brake Electric 2pin Set 2.3mm Rotors Optional","description":"\u003cstyle\u003e\n  .yanzo-tab-container {\n    font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, sans-serif;\n    margin-top: 15px;\n    width: 100%;\n    box-sizing: border-box;\n  }\n\n  \/* 隐藏单选框原生的 radio 按钮 *\/\n  .yanzo-tab-container input[type=\"radio\"] {\n    display: none;\n  }\n\n  \/* 采用 4 列等宽网格（Grid 1:1:1:1），保证间距绝对均匀 *\/\n  .yanzo-tab-headers {\n    display: grid;\n    grid-template-columns: repeat(4, 1fr);\n    border-bottom: 2px solid #E5E7EB;\n    margin-bottom: 20px;\n    width: 100%;\n    text-align: center;\n  }\n\n  .yanzo-tab-headers label {\n    padding: 10px 0;\n    font-size: 11px;\n    font-weight: 700;\n    letter-spacing: 0.2px;\n    color: #6B7280;\n    background: none;\n    border-bottom: 2px solid transparent;\n    margin-bottom: -2px;\n    cursor: pointer;\n    text-transform: uppercase;\n    transition: all 0.2s ease;\n    white-space: nowrap;\n    overflow: hidden;\n    text-overflow: ellipsis;\n  }\n\n  \/* 选中状态下的 Tab 按钮样式 *\/\n  #tab-desc:checked ~ .yanzo-tab-headers label[for=\"tab-desc\"],\n  #tab-specs:checked ~ .yanzo-tab-headers label[for=\"tab-specs\"],\n  #tab-qa:checked ~ .yanzo-tab-headers label[for=\"tab-qa\"],\n  #tab-shipping:checked ~ .yanzo-tab-headers label[for=\"tab-shipping\"] {\n    color: #111827;\n    border-bottom-color: #111827;\n  }\n\n  \/* 内容面板默认隐藏 *\/\n  .yanzo-tab-panel {\n    display: none;\n  }\n\n  \/* 根据选中的 Radio 显示对应的内容面板 *\/\n  #tab-desc:checked ~ .yanzo-tab-content #content-desc,\n  #tab-specs:checked ~ .yanzo-tab-content #content-specs,\n  #tab-qa:checked ~ .yanzo-tab-content #content-qa,\n  #tab-shipping:checked ~ .yanzo-tab-content #content-shipping {\n    display: block;\n  }\n\n  \/* 详情页排版样式 *\/\n  .yanzo-h2 {\n    font-size: 17px;\n    font-weight: 800;\n    letter-spacing: 0.5px;\n    text-transform: uppercase;\n    margin: 0 0 6px 0;\n    color: #111827;\n  }\n  .yanzo-subhead {\n    font-size: 12px;\n    font-weight: 700;\n    text-transform: uppercase;\n    color: #4B5563;\n    margin: 0 0 12px 0;\n    letter-spacing: 0.3px;\n  }\n  .yanzo-intro {\n    font-size: 13px;\n    line-height: 1.6;\n    color: #4B5563;\n    margin-bottom: 20px;\n    padding-bottom: 16px;\n    border-bottom: 1px solid #F3F4F6;\n  }\n  .yanzo-features-title {\n    font-size: 14px;\n    font-weight: 800;\n    text-transform: uppercase;\n    letter-spacing: 0.5px;\n    margin-bottom: 10px;\n  }\n  .yanzo-list {\n    margin: 0;\n    padding-left: 18px;\n  }\n  .yanzo-list li {\n    font-size: 13px;\n    line-height: 1.6;\n    color: #374151;\n    margin-bottom: 8px;\n  }\n  .yanzo-list li strong {\n    color: #111827;\n  }\n\n  \/* Q\u0026A 专属样式 *\/\n  .yanzo-qa-item {\n    margin-bottom: 16px;\n    padding-bottom: 12px;\n    border-bottom: 1px dashed #E5E7EB;\n  }\n  .yanzo-qa-item:last-child {\n    border-bottom: none;\n  }\n  .yanzo-qa-q {\n    font-size: 13px;\n    font-weight: 700;\n    color: #111827;\n    margin-bottom: 4px;\n    display: flex;\n    gap: 6px;\n  }\n  .yanzo-qa-a {\n    font-size: 13px;\n    line-height: 1.5;\n    color: #4B5563;\n    padding-left: 22px;\n  }\n\u003c\/style\u003e\n\n\u003cdiv class=\"yanzo-tab-container\"\u003e\n  \u003c!-- 隐藏的控制状态 Radio 按钮 --\u003e\n  \u003cinput type=\"radio\" id=\"tab-desc\" name=\"yanzo-tabs\" checked\u003e\n  \u003cinput type=\"radio\" id=\"tab-specs\" name=\"yanzo-tabs\"\u003e\n  \u003cinput type=\"radio\" id=\"tab-qa\" name=\"yanzo-tabs\"\u003e\n  \u003cinput type=\"radio\" id=\"tab-shipping\" name=\"yanzo-tabs\"\u003e\n\n  \u003c!-- 网格平分 4 个 Tab 按钮 --\u003e\n  \u003cdiv class=\"yanzo-tab-headers\"\u003e\n    \u003clabel for=\"tab-desc\"\u003eDETAILS\u003c\/label\u003e\n    \u003clabel for=\"tab-specs\"\u003eSPECS\u003c\/label\u003e\n    \u003clabel for=\"tab-qa\"\u003eQ\u0026amp;A\u003c\/label\u003e\n    \u003clabel for=\"tab-shipping\"\u003eSHIPPING\u003c\/label\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- 选项卡对应的具体内容区域 --\u003e\n  \u003cdiv class=\"yanzo-tab-content\"\u003e\n    \u003c!-- 面板 1: DETAILS --\u003e\n    \u003cdiv class=\"yanzo-tab-panel\" id=\"content-desc\"\u003e\n      \u003cdiv class=\"yanzo-h2\"\u003eTEKTRO E3940 E-BIKE HYDRAULIC DISC BRAKE SET (POWER CUT-OFF SENSOR)\u003c\/div\u003e\n      \u003cdiv class=\"yanzo-subhead\"\u003eLEFT-FRONT 900MM ONE-PIECE \u0026amp; RIGHT-REAR 1850MM SPLIT HOSE CONFIGURATION\u003c\/div\u003e\n      \u003cdiv class=\"yanzo-intro\"\u003e\n        Upgrade your high-speed electric bicycle, cargo bike, or heavy-duty E-MTB with the Tektro E3940 hydraulic disc brake set. Engineered specifically for E-Bikes, it features integrated electric power cut-off sensors to instantly disable motor drive during braking. This setup includes a pre-bled 900mm left-front system and an extended 1850mm right-rear system designed with a split hose connection for effortless internal frame routing.\n      \u003c\/div\u003e\n      \u003cdiv class=\"yanzo-features-title\"\u003eFEATURES\u003c\/div\u003e\n      \u003cul class=\"yanzo-list\"\u003e\n        \u003cli\u003e\n\u003cstrong\u003eE-Bike Electric Power Cut-Off Sensor:\u003c\/strong\u003e Integrated electrical brake sensor cuts motor power immediately upon lever pull, dramatically enhancing stopping safety and reducing motor drag.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eLeft-Front 900mm One-Piece Assembly:\u003c\/strong\u003e Pre-bled, fully connected left-front brake ready for quick bolt-on installation.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eRight-Rear 1850mm Split Hose System:\u003c\/strong\u003e Features a quick-connect \/ split hose design that simplifies internal frame routing without losing fluid.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eHeavy-Duty Heat Dissipation:\u003c\/strong\u003e Calipers engineered for maximum heat tolerance and consistent lever feel under high-speed E-Bike stopping loads.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eMultiple Rotor Bundle Options:\u003c\/strong\u003e Choose between the standalone brake set or complete packages featuring 2.3mm heavy-duty unbranded rotors (180mm, 203mm, or mixed size).\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n\n    \u003c!-- 面板 2: SPECS --\u003e\n    \u003cdiv class=\"yanzo-tab-panel\" id=\"content-specs\"\u003e\n      \u003cul class=\"yanzo-list\"\u003e\n        \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e TEKTRO\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e E3940\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eBrake System Type:\u003c\/strong\u003e Hydraulic Disc Brake with Power Cut-Off Sensor\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eHose Orientation \u0026amp; Length:\u003c\/strong\u003e\n          \u003cul\u003e\n            \u003cli\u003e\n\u003cstrong\u003eLeft Front:\u003c\/strong\u003e 900 mm (Integrated One-Piece)\u003c\/li\u003e\n            \u003cli\u003e\n\u003cstrong\u003eRight Rear:\u003c\/strong\u003e 1850 mm (Split Hose \/ Quick Disconnect Design for Internal Routing)\u003c\/li\u003e\n          \u003c\/ul\u003e\n        \u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eFluid Type:\u003c\/strong\u003e Mineral Oil (Pre-bled)\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eSensor Plug Type:\u003c\/strong\u003e Standard E-Bike Motor Cut-off Connector\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eAvailable Bundle Options:\u003c\/strong\u003e\n          \u003cul\u003e\n            \u003cli\u003e\n\u003cstrong\u003eBrake Set Only:\u003c\/strong\u003e Front \u0026amp; Rear Calipers + Levers (Pre-bled)\u003c\/li\u003e\n            \u003cli\u003e\n\u003cstrong\u003eBrake Set + 2x 180mm Rotors:\u003c\/strong\u003e Includes 2x 180mm Heavy-Duty Rotors (2.3mm thick, Unbranded)\u003c\/li\u003e\n            \u003cli\u003e\n\u003cstrong\u003eBrake Set + 2x 203mm Rotors:\u003c\/strong\u003e Includes 2x 203mm Heavy-Duty Rotors (2.3mm thick, Unbranded)\u003c\/li\u003e\n            \u003cli\u003e\n\u003cstrong\u003eBrake Set + Mixed Rotors:\u003c\/strong\u003e Includes 1x 180mm + 1x 203mm Heavy-Duty Rotors (2.3mm thick, Unbranded)\u003c\/li\u003e\n          \u003c\/ul\u003e\n        \u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003ePackaging:\u003c\/strong\u003e Genuine Tektro Workshop \/ Bulk Packaging\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n\n    \u003c!-- 面板 3: Q\u0026A --\u003e\n    \u003cdiv class=\"yanzo-tab-panel\" id=\"content-qa\"\u003e\n      \u003cdiv class=\"yanzo-qa-item\"\u003e\n        \u003cdiv class=\"yanzo-qa-q\"\u003e\n\u003cspan\u003eQ:\u003c\/span\u003e What is the advantage of the split hose (分体) on the rear brake?\u003c\/div\u003e\n        \u003cdiv class=\"yanzo-qa-a\"\u003eA: The 1850mm rear hose features a split disconnect design, making it extremely easy to route through internal bicycle frames without disconnecting the main caliper or needing a complex bleed afterward.\u003c\/div\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv class=\"yanzo-qa-item\"\u003e\n        \u003cdiv class=\"yanzo-qa-q\"\u003e\n\u003cspan\u003eQ:\u003c\/span\u003e Will the motor cut-off sensor work with my E-Bike controller?\u003c\/div\u003e\n        \u003cdiv class=\"yanzo-qa-a\"\u003eA: The E3940 features standard E-Bike power cut-off wiring. It is compatible with most standard motor controllers (Bafang, Rad Power, Lectric, Ariel Rider, etc.) that support two-pin\/three-pin brake sensor inputs.\u003c\/div\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv class=\"yanzo-qa-item\"\u003e\n        \u003cdiv class=\"yanzo-qa-q\"\u003e\n\u003cspan\u003eQ:\u003c\/span\u003e Are 2.3mm thick rotors necessary for E-Bikes?\u003c\/div\u003e\n        \u003cdiv class=\"yanzo-qa-a\"\u003eA: 2.3mm extra-thick rotors provide superior stiffness and thermal capacity compared to standard 1.8mm rotors, significantly reducing heat warping and brake fade under high weight and motor speed.\u003c\/div\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003c!-- 面板 4: SHIPPING --\u003e\n    \u003cdiv class=\"yanzo-tab-panel\" id=\"content-shipping\"\u003e\n      \u003cul class=\"yanzo-list\"\u003e\n        \u003cli\u003e\n\u003cstrong\u003eProcessing Time:\u003c\/strong\u003e Ships within 24–48 hours from our California warehouse.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eDelivery Time:\u003c\/strong\u003e Standard shipping usually arrives within 3–7 business days across the US mainland.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eTracking:\u003c\/strong\u003e Tracking information will be emailed immediately once your package is dispatched.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"Tektro","offers":[{"title":"Brakes Only","offer_id":53805033586988,"sku":"MK146-US-Brakes Only","price":144.99,"currency_code":"USD","in_stock":true},{"title":"Brakes \u0026 2*180mm Thickness Disc Brake Rotor 2.3MM E-Bike","offer_id":53805033619756,"sku":"MK146-US-Brakes \u0026 2*180mm Thickness Disc Brake Rotor 2.3MM E-Bike","price":169.99,"currency_code":"USD","in_stock":true},{"title":"Brakes \u0026 2*203mm Thickness Disc Brake Rotor 2.3MM E-Bike","offer_id":53805033652524,"sku":"MK146-US-Brakes \u0026 2*203mm Thickness Disc Brake Rotor 2.3MM E-Bike","price":173.99,"currency_code":"USD","in_stock":true},{"title":"Brakes \u0026 180mm+203mm Set Thickness Disc Brake Rotor 2.3MM E-Bike","offer_id":53805033685292,"sku":"MK146-US-Brakes \u0026 180mm+203mm Set Thickness Disc Brake Rotor 2.3MM E-Bike","price":173.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0944\/3357\/5212\/files\/Main_Image_TEKTRO_E3940_4-Piston_E-Bike_Hydraulic_Disc_Brake_Set_Left_Front_Right_Rear.jpg?v=1787308104","url":"https:\/\/yanzocycling.com\/products\/tektro-hd-e3940-e-bike-power-control-4-pistons-hydraulic-brake-electric-2pin-set","provider":"YanzoCycling","version":"1.0","type":"link"}