Ruizuma M402 Four-Piston Abalone Brake Caliper | E-Motorcycle

Ruizuma M402 Large Abalone Four-Piston Brake Caliper for Electric Motorcycles

Upgrade your electric motorcycle's front braking system with the Ruizuma M402 Abalone Brake Caliper. Engineered with a track-level opposed four-piston design, this forged aluminum alloy caliper delivers strong, evenly distributed clamping force, dramatically shortening stopping distances while maintaining a smooth, linear feel — whether you're commuting daily or pushing hard on spirited rides.

Key Features

🔵 Track-Level Big Four-Piston Design

• Opposed four-piston cylinder body for linear, progressive braking force with zero abruptness — stop confidently every time
• Maintains consistent braking performance during high-speed riding and intensive cycling sessions
• Optimised return structure minimises brake drag and uneven wear, extending brake pad service life

🔵 Forged Aluminium Alloy + CNC Precision Milling

• Aviation-grade forged aluminium alloy body, CNC-milled in one piece for maximum rigidity with minimal weight
• Hard anodised surface finish — corrosion-resistant, scratch-resistant, and colour-retaining for a lasting metallic look
• Lightweight construction reduces unsprung mass, improving handling and overall ride maneuverability

🔵 Wide Vehicle Compatibility – Bolt-On Installation

• Standard mounting hole pattern compatible with the vast majority of electric motorcycles on the market
• Fits 220 mm and 240 mm disc rotors; matching adapter brackets included for a direct bolt-on fit — no grinding or cutting required
• Available in Left (L) and Right (R) versions for clear, correct fitment across different vehicle layouts

🔵 Upgraded Sealing System

• High-temperature-resistant seals compatible with DOT3 and DOT4 brake fluid for superior leak prevention
• Built-in bleeder screw port makes air bleeding simple — even first-time installers can complete setup with ease
• Resists thermal fade during continuous braking, ensuring a consistent lever feel on commutes and longer runs alike

🔵 Genuine Product Assurance

• RZMA laser anti-counterfeiting label on every unit — scan to verify authenticity
• Available in Silver or Black to complement any modification aesthetic
• Recommended use with DOT4 brake fluid; bleed the system before installation
• Break-in period of 50–100 km recommended for optimal braking performance

Specifications

Pair It With These Essentials

• 0–50 PSI Dial Tire Pressure Gauge – Car, Motorcycle & Bike — Keep tyre pressure perfectly tuned alongside your brake upgrade.
• 1.5L Electric Foam Sprayer – Portable High-Pressure Car Wash Gun — Keep your calipers clean and protected after every ride.

Safety & Maintenance Guidance

For guidance on motorcycle braking system safety and maintenance best practices, refer to the U.S. Consumer Product Safety Commission (CPSC). Regularly inspect brake pad thickness and caliper seals to ensure your braking system remains in peak condition.

Learn more: Disc brake

Frequently Asked Questions

Q: Is the Ruizuma M402 abalone brake caliper compatible with my electric motorcycle?

A: The M402 features a standard mounting hole pattern designed to fit the vast majority of electric motorcycles. It supports 220 mm and 240 mm disc rotors, and the package includes adapter brackets for a direct bolt-on installation without grinding or modification. Check your disc rotor size and verify left/right (L/R) orientation before ordering.

Q: What brake fluid should I use with the Ruizuma M402 caliper?

A: The M402 is compatible with both DOT3 and DOT4 brake fluid. Ruizuma recommends DOT4 for optimal performance. Always bleed all air from the brake line before riding, and complete a 50–100 km break-in period to allow the brake pads and caliper to fully seat for the best braking response.

Q: How does the four-piston design improve braking compared to a standard two-piston caliper?

A: The opposed four-piston design applies clamping force across a larger, more even area of the brake pad, resulting in stronger, more consistent deceleration with a smoother, more progressive lever feel. This reduces braking distance and helps maintain stable performance during intense or prolonged riding without the thermal fade that can affect lower-spec calipers.

Q: Does the M402 caliper come in different colours?

A: Yes — the Ruizuma M402 is available in both Silver and Black finishes, each with a hard-anodised surface for long-lasting durability and a premium metallic look. Choose the colour that best complements your motorcycle's style.