{"product_id":"fjn-st1-small-crab-4-piston-brake-caliper-cnc-aluminum-ev","title":"FJN ST1 4-Piston CNC Brake Caliper for Electric Vehicles","description":"\n\u003ch2\u003eFJN ST1 Small Crab Four-Piston Brake Caliper – CNC Aluminum Alloy Modified Upgrade\u003c\/h2\u003e\n\n\u003cp\u003eTake your electric vehicle's stopping power to the next level with the \u003cstrong\u003eFJN ST1 Small Crab Brake Caliper\u003c\/strong\u003e. Engineered with a high-performance four-piston design and CNC-machined aluminum alloy construction, this caliper delivers precise, linear braking response whether you're cruising city streets or navigating slippery roads. Made in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003e🔴 Responsive Four-Piston Braking Performance\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-performance piston design\u003c\/strong\u003e ensures sensitive braking response with linear force output — light squeeze delivers tactile feedback; heavy braking stays firmly controlled.\u003c\/li\u003e\n  \u003cli\u003eMaintains confident stopping ability even in rainy or low-traction conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSmall Crab structure\u003c\/strong\u003e specially tuned for electric vehicles, balancing lightweight construction with structural rigidity for a balanced soft-to-firm braking feel — eliminating the common \"soft front, hard rear\" imbalance found in stock brakes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e🔴 Premium CNC Craftsmanship \u0026amp; Corrosion Resistance\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-strength aluminum alloy body\u003c\/strong\u003e with CNC integrated engraving for precise tolerances and consistent performance.\u003c\/li\u003e\n  \u003cli\u003eSurface wire-drawing and \u003cstrong\u003eanodizing treatment\u003c\/strong\u003e provides excellent anti-corrosion and anti-aging protection — resists fading and rust over years of regular use.\u003c\/li\u003e\n  \u003cli\u003eBuilt-in high-spec sealing components and \u003cstrong\u003edust-proof structure\u003c\/strong\u003e keep out water and mud — safe for high-pressure water gun washing and all-weather riding. Reduces the likelihood of caliper jamming and abnormal noise.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e🔴 Wide Compatibility – Easy Bolt-On Upgrade\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with most \u003cstrong\u003e10-inch to 12-inch wheels\u003c\/strong\u003e; pairs optimally with \u003cstrong\u003e220mm or 200mm brake discs\u003c\/strong\u003e for best braking performance.\u003c\/li\u003e\n  \u003cli\u003eReserved universal oil pipe interface, compatible with most OEM and aftermarket brake pumps — no need to replace your entire system.\u003c\/li\u003e\n  \u003cli\u003eReady to install straight out of the box — each unit passes strict pressure and sealing tests before leaving the factory (zero leakage, zero abnormal noise guaranteed).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e🔴 Striking Appearance Meets Serious Function\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eMetal-textured body paired with a \u003cstrong\u003edistinctive red FJN logo\u003c\/strong\u003e for a sleek, performance-inspired aesthetic.\u003c\/li\u003e\n  \u003cli\u003eBenchmarks the performance of imported and Taiwanese calipers at a fraction of the cost — maximum safety upgrade, minimum spend.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e📋 Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFJN ST1 (JK26)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePiston Configuration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFour-piston\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCNC Aluminum Alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface Treatment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWire Drawing + Anodizing\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Wheel Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10–12 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Disc Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e200mm \/ 220mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOil Interface\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUniversal (OEM \u0026amp; Aftermarket)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003e⚙️ Installation Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eAfter installation, \u003cstrong\u003ebleed the brake oil line\u003c\/strong\u003e to remove air and ensure full braking force.\u003c\/li\u003e\n  \u003cli\u003eNew calipers and brake pads require a \u003cstrong\u003e30–50 km break-in period\u003c\/strong\u003e before reaching peak performance.\u003c\/li\u003e\n  \u003cli\u003ePeriodically check brake fluid level and caliper piston return for long-term reliability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e🔗 Related Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/0-50-psi-dial-tire-pressure-gauge-car-motorcycle-bike\"\u003e0–50 PSI Dial Tire Pressure Gauge – Car, Motorcycle \u0026amp; Bike\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-5l-electric-high-pressure-foam-sprayer-portable-car-wash-gun\"\u003e1.5L Electric Foam Sprayer – Portable High-Pressure Car Wash Gun\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-2-inch-drive-wheel-protector-impact-socket-set-storage-case\"\u003e1\/2\" Drive Wheel Protector Impact Socket Set + Storage Case\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor more information on safe braking practices and vehicle maintenance standards, visit the U.S. Consumer Product Safety Commission (CPSC).\u003c\/p\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Disc_brake\" target=\"_blank\" rel=\"noopener\"\u003eDisc brake\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003ch4\u003eQ: What wheel sizes is the FJN ST1 Small Crab brake caliper compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: The FJN ST1 is compatible with most \u003cstrong\u003e10-inch to 12-inch wheels\u003c\/strong\u003e and works best when paired with a \u003cstrong\u003e200mm or 220mm brake disc\u003c\/strong\u003e. It also features a universal oil pipe interface that fits most OEM and aftermarket brake pumps.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does the FJN ST1 caliper require a break-in period?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. Like all new brake calipers and pads, the FJN ST1 requires approximately \u003cstrong\u003e30–50 kilometers of riding\u003c\/strong\u003e to fully seat the brake pads against the disc. During this break-in period, braking performance will gradually improve to its optimal level.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is the FJN ST1 caliper waterproof and suitable for all-weather riding?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. The FJN ST1 features built-in high-spec sealing components and a dust-proof structure that make it resistant to water and mud. It can withstand high-pressure water gun washing and is designed for confident use in rainy or wet riding conditions.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What surface treatment does the caliper use to prevent corrosion?\u003c\/h4\u003e\n\u003cp\u003eA: The caliper body undergoes both \u003cstrong\u003ewire-drawing and anodizing surface treatment\u003c\/strong\u003e, giving it excellent resistance to corrosion, aging, fading, and rust — ensuring long-lasting good looks and reliable performance over time.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What wheel sizes is the FJN ST1 Small Crab brake caliper compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The FJN ST1 is compatible with most 10-inch to 12-inch wheels and works best when paired with a 200mm or 220mm brake disc. 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