{"product_id":"hayes-dominion-a4-disc-brake-lever-dbkl0682-mtb-flat-bar-disc-brakes","title":"Hayes Dominion A4 Hydraulic Disc Brake Set - Four-Piston Post Mount, Lightweight Aluminum, Sintered Pads, E-Bike Compatible, Purple - Black","description":"\u003cdiv id=\"seqbpdescription-1\"\u003e\u003cp\u003eExperience unrivaled braking power with the Hayes Dominion A4 Disc Brake and Lever - engineered specifically for downhill, enduro, and e-bike riders seeking optimal control, durability, and style. Available in a vibrant Purple\/Black finish, this hydraulic post-mount brake offers exceptional performance and innovative features designed for serious cyclists.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-2\"\u003e\u003cp\u003eMaterials \u0026amp; Construction\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-3\"\u003e\u003cp\u003eCrafted with premium materials, the Hayes Dominion A4 features a robust four-piston caliper designed to withstand the demanding rigors of downhill and enduro riding. The pre-bled Hayes K2 Kevlar weave hydraulic hose ensures maximum stiffness and minimal flex, delivering direct power transmission for confident braking in any trail condition. The high-temperature resistant DOT 5.1 brake fluid provides consistent modulation and rapid response, even under extreme heat generated during aggressive descents.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-4\"\u003e\u003cp\u003ePerformance \u0026amp; Engineering\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-5\"\u003e\u003cp\u003eBuilt for high-performance demands, the Dominion A4 boasts low-effort lever input (LoFi technology) that offers an exceptional braking feel with minimal finger effort, enhancing rider control and reducing fatigue. The factory-tuned master cylinder ensures a crisp bite point and minimal dead stroke for immediate feedback, making it ideal for technical descents and fast-paced riding. Compatibility with Hayes D-series rotors (sold separately) ensures seamless integration with your existing setup, with dedicated pad compounds for fast burnish and reliable friction across temperature ranges.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-6\"\u003e\u003cp\u003eComponents \u0026amp; Technology\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-7\"\u003e\u003cp\u003eThe brake system includes two specially developed pad compounds: semi-metallic T106 for standard conditions and sintered T100 optimized for wet or muddy terrain, providing versatility across different riding environments. Precise adjustability features such as adjustable contact point and reach allow riders to customize the feel for maximum comfort and responsiveness. Designed to accommodate both left and right hand configurations, this brake ensures versatility and adaptability for your bike.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-8\"\u003e\u003cp\u003eStyle \u0026amp; Use Case\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-9\"\u003e\u003cp\u003eThe eye-catching Purple\/Black colorway complements aggressive mountain biking rigs and stylish enduro builds alike. Whether you're tackling downhill trails, enduro races, or electric mountain bikes (e-bike compatibility), the Dominion A4 excels in delivering reliable, predictable braking performance. Lightweight at just 320g (including the lever), it enhances your bike's agility without sacrificing strength.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-10\"\u003e\u003cp\u003eInnovative \u0026amp; Differentiating Features\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-11\"\u003e\u003cp\u003e- Dual Pad Compatibility: Includes both semi-metallic and sintered pads for optimal performance in varied conditions\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-12\"\u003e\u003cp\u003e- High-Performance Hydraulic System: DOT 5.1 fluid ensures high boiling point and consistent modulation\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-13\"\u003e\u003cp\u003e- Stiff Kevlar Hose Construction: Maximizes power transmission and brake response\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-14\"\u003e\u003cp\u003e- Designed for E-bikes \u0026amp; Heavy-Duty Use: Engineered to handle increased torque and heat generation typical of e-mountain biking\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-15\"\u003e\u003cp\u003eSpecifications \u0026amp; Compatibility\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-16\"\u003e\u003cp\u003e- Post Mount caliper (74mm)\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-17\"\u003e\u003cp\u003e- Hydraulic lever (left or right) adjustable contact point and reach\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-18\"\u003e\u003cp\u003e- Compatible with D-series rotors (sold separately) - part# HY-8710\/12\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-19\"\u003e\u003cp\u003e- Hydraulic hose length: 1800mm\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-20\"\u003e\u003cp\u003e- Weight: Approximately 320g (kit)\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-21\"\u003e\u003cp\u003e- Color: Purple\/Black\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-22\"\u003e\u003cp\u003e- E-bike compatible, optimized for high-stress mountain biking scenarios\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-23\"\u003e\u003cp\u003eUpgrade your mountain bike with the Hayes Dominion A4 Disc Brake and Lever for unmatched stopping power, precision control, and durability. Experience the difference in your descents-prepared to conquer the most challenging trails with confidence.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpfeatures\"\u003e\u003cul\u003e\n\u003cli\u003eHigh-performance four-piston hydraulic disc brake optimized for downhill and enduro riding, providing powerful and consistent stopping power in demanding conditions. \u003c\/li\u003e\n\u003cli\u003eConstructed with durable Hayes K2 Kevlar weave hose for maximum stiffness and optimal power transmission, minimizing brake fade during intense rides. \u003c\/li\u003e\n\u003cli\u003eFeatures quick-release, post-mount calipers with adjustable contact point and reach, allowing precise customization for superior control and comfort on rugged terrains. \u003c\/li\u003e\n\u003cli\u003eIncludes specially developed pad compounds-semi-metallic T106 for everyday riding and sintered T100 for wet, muddy conditions-ensuring reliable braking across diverse weather conditions. \u003c\/li\u003e\n\u003cli\u003eDesigned in a striking purple and black finish, with compatibility for e-bikes, and sold as a complete front or rear kit-perfect for aggressive trail riding, enduro competitions, and mountain biking enthusiasts.\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/div\u003e","brand":"Hayes","offers":[{"title":"Default Title","offer_id":42743758520387,"sku":"DBKL0682","price":249.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1608\/6187\/files\/BR0409.jpg?v=1779353542","url":"https:\/\/365cycles.com\/products\/hayes-dominion-a4-disc-brake-lever-dbkl0682-mtb-flat-bar-disc-brakes","provider":"365 Cycles","version":"1.0","type":"link"}