Armortech Rear Brake Backing Plate Seal O‑Ring – Fits Honda TRX300 / TRX300FW (1988‑2000) – Replaces OEM 91355‑HC4‑003

OVERVIEW

This Armortech Rear Brake Backing Plate Seal O‑Ring serves as a direct factory replacement designed to maintain watertight integrity in the rear brake assembly of select Honda ATVs. Precision-engineered from durable elastomer construction, this O‑ring prevents moisture and particulate contamination, ensuring reliable stopping power and long-term brake cover sealing.

ENGINEERING & PERFORMANCE

Sized to match original equipment tolerances, this seal delivers consistent compression under vibration and thermal cycling, maintaining an effective barrier against track spray and field grit. The robust rubber composition resists cracking and deformation, preserving secure cover pressure and extending service life without requiring specialized adjustment during installation.

KEY FEATURES

• Direct replacement for factory rear brake backing plate seals
• Replaces OEM part number 91355‑HC4‑003
• High-performance elastomer construction for lasting elasticity
• Prevents water, dirt, and abrasive debris from entering the brake assembly
• Maintains proper sealing of the rear brake cover
• Protects internal drum brake mechanisms from premature wear
• Manufactured in Taiwan

TECHNICAL SPECIFICATIONS

• Brand: Armortech
• Part Name: Rear Brake Backing Plate Seal O‑Ring
• Component Type: O‑Ring Seal
• Material: Rubber
• Supported Years: 1988–2000
• Compatible Trims: Honda TRX300 FourTrax, TRX300FW FourTrax 4x4

FITMENT

• Honda TRX300 FourTrax (1988–2000)
• Honda TRX300FW FourTrax 4x4 (1988, 1990–2000)

WHY RIDERS CHOOSE THIS

Riders rely on this Armortech seal to restore predictable braking performance after factory gaskets degrade from age or off-highway exposure. The exact dimensional profile guarantees straightforward swap-out compatibility, while the flexible rubber material accommodates seasonal temperature shifts without losing clamping force. By permanently excluding water and sand from the backing plate envelope, this affordable replacement component drastically cuts downtime and preserves critical rear brake hardware for consistent ride safety.