100mm Radial Mount 4-Piston Brake Caliper – Motorcycle Modification Upgrade

Take your motorcycle's stopping power to the next level with this precision-engineered 100mm radial mount four-piston brake caliper. Crafted from aviation-grade aluminum alloy using five-axis CNC forging technology, this track-grade caliper delivers confident, linear braking performance with a smooth, controlled feel — whether you're carving mountain roads or pushing hard on the track.

⚙️ Four-Piston Braking Performance

Equipped with 4 × 34mm opposed pistons, braking force is distributed evenly across the full pad surface, eliminating uneven wear and delivering a linear, precise feel at the lever. Compared to standard dual-piston calipers, braking efficiency is improved by over 60% — high-speed stops feel planted and controlled, with no unwanted forward dive or tail movement.

🔧 Universal 100mm Radial Locking Point – Bolt-On Fit

Features a standard 100mm center-to-center radial mount design, compatible with a wide range of motorcycles. No additional adapters or custom machining required — simply unbolt the old caliper and bolt this one on for an immediate braking system upgrade.

✈️ CNC Forged Aluminum Alloy Construction

Built from aviation-grade aluminum alloy using integrated forging and five-axis CNC precision machining. The hollow lightweight structure balances rigidity with excellent heat dissipation, maintaining consistent braking performance even during sustained high-intensity use. Choose from two finishes:

Aurora Silver: High-gloss mirror polish — bold, eye-catching, complements brightly colored builds
Midnight Black: Low-profile matte texture — scratch and dirt resistant, ideal for blacked-out or stealth-style motorcycles

✅ Track-Level Details & Component Quality

High-temperature fluororubber oil seals — resist heat, cold, rain, and sun without leaking or jamming
High-rigidity reinforced caliper body — impact and deformation resistant for confident braking on uneven roads
High-precision piston seals — ensure smooth, clean piston return with zero brake drag, preserving disc and pad life
Material: Aluminum Alloy
Piston configuration: 4 × 34mm opposed pistons
Mount center distance: 100mm radial
Model: JK26
Made in Mainland China

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For more information on motorcycle brake system safety standards, visit the U.S. Consumer Product Safety Commission (CPSC).

Frequently Asked Questions

Q: What motorcycles are compatible with this 100mm radial brake caliper?

A: This caliper uses a standard 100mm center-to-center radial locking point, which is a widely used mounting standard on sport bikes and modified motorcycles. Most bikes with a 100mm radial mount fork bracket will accept this caliper without an adapter. Always verify your fork's mounting spec before purchase.

Q: What is the difference between the Aurora Silver and Midnight Black finish options?

A: The Aurora Silver finish uses a high-gloss mirror polishing process for a striking, premium look that pairs well with brightly colored or chrome-accented builds. The Midnight Black uses a matte texture that is more resistant to showing dirt and minor scuffs, and suits stealth or blacked-out motorcycle builds.

Q: Does this 4-piston radial caliper require brake fluid or additional hardware to install?

A: The caliper set includes the caliper unit itself. You will need to supply compatible brake pads, banjo bolts, and brake fluid appropriate for your motorcycle's braking system. No adapter bracket is needed for 100mm radial fork mounts, making installation straightforward for experienced mechanics or enthusiasts.

Q: How does the fluororubber oil seal improve caliper durability?

A: Fluororubber (FKM) seals are engineered to withstand extreme temperatures — both the intense heat generated during sustained braking and cold-weather conditions. They resist swelling, hardening, and leaking far better than standard rubber seals, ensuring consistent caliper performance and long service life.