Front Brake Caliper Piston For Honda TRX 420 2007 To 2017 And TRX 500 2012 To 2017 Fits TRX420 TRX500FA 2015 To 2017

This Front Brake Caliper Piston for Honda TRX 420 and TRX 500-series ATVs is a precision 32mm replacement that restores proper hydraulic force and smooth piston travel in the front caliper. Engineered to drop straight into the original front caliper on TRX 420 models (2007–2017) and TRX 500-series machines (FA, FPA, FE/FM), it helps recover confident braking performance after wear or corrosion has compromised the seal. Replacing a worn piston eliminates fluid leaks and piston sticking, delivering consistent stopping power on the trail or farm.

Built to endure rugged use, this aftermarket piston delivers reliable performance where it matters most—under mud, grit, and weather exposure. It targets the common failure modes that plague aging front calipers, such as corrosion and imperfect seal surfaces, providing a cost-effective maintenance option that keeps you moving without a full caliper replacement.

Comprehensive Vehicle Fitment

Fitment notes reflect OEM references for front caliper pistons used on these Honda TRX 420/500 platforms.

Product Specifications

OEM & Aftermarket Cross-Reference Information

What's Included

The following component is included in the package:

• Front brake caliper piston (32mm)

Notes: Seals, boots, and other related front caliper hardware are not included and may be sold separately.

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility—engineered to drop right into Honda TRX 420/500 front calipers without modification.
• OEM Cross-Reference—matches the OEM 45107-HP5-601 specification for a precise, reliable replacement.
• Precision Machining—tolerances tailored to restore smooth piston movement and consistent braking response.
• Performance Restoration—reinstates proper clamping force and pedal feel after piston wear and corrosion.
• Trail- and Farm-Ready Durability—built to withstand the grit, moisture, and temperature swings typical of off-road use.
• Cost-Effective Maintenance—a focused replacement that extends caliper life and keeps maintenance affordable.

Installation Notes:

• Inspect the caliper bore for scoring or pitting; if damaged, consider full caliper service or replacement.
• Clean the bore and piston seating surfaces with brake cleaner before installation to remove rust and debris.
• Lubricate the piston edge with brake-fluid-compatible lubricant during assembly; avoid petroleum-based lubricants that can degrade seals.
• Install seals and boots if applicable and verify they seat properly around the piston to prevent fluid bypass.
• Bleed the brake system after piston installation to remove air and restore pedal firmness.
• Test for leaks and proper movement on a bench or with the wheel off the ground before road use.

Why Upgrade?

Running a worn front caliper piston can lead to brake fluid leakage, reduced braking efficiency, and uneven caliper movement, all of which compromise stopping power. Replacing with this piston restores reliable, predictable braking performance, helping you stay safe and confident under demanding trail or farm conditions.