Front brake caliper piston for Honda TRX 450 R (2004-2009), TRX 700XX (2008-2009), and Suzuki LT-F300F (1999-2002). This piston replaces a worn or damaged component to restore precise hydraulic pressure and confident stopping power in all riding conditions. Made from a high-grade, corrosion-resistant alloy to withstand mud, water, and heat, it delivers consistent performance and smooth caliper operation. It replaces OEM parts 45117-MAJ-G41 and 59100-39830 for a direct-fit upgrade that preserves original braking feel.

Designed for the trail, mud, and field work, this aftermarket piston addresses common wear symptoms like pitted surfaces, stuck or sluggish sliding, and uneven pad contact. By restoring a clean bore seal and even piston travel, it reduces brake drag, improves lever feel, and returns predictable modulation for safer, more confident braking on rough terrain and during long days in the saddle. Built for durability, it’s a reliable choice when you need repeatable, race-ready braking performance in tough off-road conditions.

Comprehensive Vehicle Fitment

Compatibility notes and OEM references guide these applications:

Product Specifications

OEM & Aftermarket Cross-Reference Information

What's Included

In the box you’ll find the exact component needed for a piston replacement:

• Front Brake Caliper Piston — 1 piece

Note: Piston seals, dust boots, and mounting hardware are not included and must be sourced separately if needed.

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility with Honda TRX 450 R, TRX 700XX, and Suzuki LT-F300F caliper bores.
• OEM Cross-Reference aligns with original Honda and Suzuki piston references for straightforward part matching.
• Premium Materials built from a corrosion-resistant alloy to resist rust and wear in off-road conditions.
• Performance Restoration restores consistent hydraulic pressure and smooth braking feel after piston wear.
• Durability for Trail & Farm Use designed to endure dusty, wet, and heat-rich environments common on trails and farmland.
• Ease of Installation engineered to drop into the original bore with proper fitment and minimal modification.

Installation Notes:

• Bleed the brake system after installation to remove air from the line and restore pedal feel.
• Inspect the caliper bore for scoring or corrosion; polish or replace if necessary before installing the new piston.
• Cleanliness is critical; keep dust seals and fluid away from the piston bore during assembly.
• Lubrication use appropriate assembly lubricant or brake fluid on the piston’s sealing surfaces, never on the brake pad faces.
• Proper orientation ensure piston orientation matches the caliper design to avoid binding or uneven pad contact.
• Torque and fasteners follow the vehicle’s service manual for caliper mounting bolt torque; do not over-torque and ensure correct alignment.

Why Upgrade?

Running a worn or pitted piston can lead to reduced braking efficiency, uneven pad contact, and a spongy or inconsistent lever feel. Replacing it with this piston restores reliable stopping power, predictable modulation, and long-term caliper health, giving you confidence on any trail or worksite. A fresh piston helps re-establish consistent hydraulic response and smoother control, especially under heavy braking or rapid deceleration.