FJN ST1 4-Piston CNC Brake Caliper for Electric Vehicles

FJN ST1 Small Crab Four-Piston Brake Caliper – CNC Aluminum Alloy Modified Upgrade

Take your electric vehicle's stopping power to the next level with the FJN ST1 Small Crab Brake Caliper. 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.

🔴 Responsive Four-Piston Braking Performance

• High-performance piston design ensures sensitive braking response with linear force output — light squeeze delivers tactile feedback; heavy braking stays firmly controlled.
• Maintains confident stopping ability even in rainy or low-traction conditions.
• Small Crab structure 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.

🔴 Premium CNC Craftsmanship & Corrosion Resistance

• High-strength aluminum alloy body with CNC integrated engraving for precise tolerances and consistent performance.
• Surface wire-drawing and anodizing treatment provides excellent anti-corrosion and anti-aging protection — resists fading and rust over years of regular use.
• Built-in high-spec sealing components and dust-proof structure 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.

🔴 Wide Compatibility – Easy Bolt-On Upgrade

• Compatible with most 10-inch to 12-inch wheels; pairs optimally with 220mm or 200mm brake discs for best braking performance.
• Reserved universal oil pipe interface, compatible with most OEM and aftermarket brake pumps — no need to replace your entire system.
• Ready 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).

🔴 Striking Appearance Meets Serious Function

• Metal-textured body paired with a distinctive red FJN logo for a sleek, performance-inspired aesthetic.
• Benchmarks the performance of imported and Taiwanese calipers at a fraction of the cost — maximum safety upgrade, minimum spend.

📋 Specifications

⚙️ Installation Notes

• After installation, bleed the brake oil line to remove air and ensure full braking force.
• New calipers and brake pads require a 30–50 km break-in period before reaching peak performance.
• Periodically check brake fluid level and caliper piston return for long-term reliability.

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For more information on safe braking practices and vehicle maintenance standards, visit the U.S. Consumer Product Safety Commission (CPSC).

Learn more: Disc brake

Frequently Asked Questions

Q: What wheel sizes is the FJN ST1 Small Crab brake caliper compatible with?

A: 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. It also features a universal oil pipe interface that fits most OEM and aftermarket brake pumps.

Q: Does the FJN ST1 caliper require a break-in period?

A: Yes. Like all new brake calipers and pads, the FJN ST1 requires approximately 30–50 kilometers of riding to fully seat the brake pads against the disc. During this break-in period, braking performance will gradually improve to its optimal level.

Q: Is the FJN ST1 caliper waterproof and suitable for all-weather riding?

A: 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.

Q: What surface treatment does the caliper use to prevent corrosion?

A: The caliper body undergoes both wire-drawing and anodizing surface treatment, giving it excellent resistance to corrosion, aging, fading, and rust — ensuring long-lasting good looks and reliable performance over time.