FactionFab Titanium Rear Brake Shim Set 2018-2021 STI | Thermal Insulation | Brake System Upgrade

Overview

The FactionFab Titanium Rear Brake Shim Set is designed specifically for the 2018-2021 Subaru WRX STI, providing a critical thermal barrier between the brake pads and caliper pistons. This set of shims helps reduce heat transfer during aggressive driving conditions such as track days and autocross events, where brake fade can compromise safety and performance. By insulating the caliper pistons from excessive heat, these shims help maintain consistent braking power and extend the life of your brake pads.

Engineered from high-grade 6AL-4V (Grade 5) titanium, these shims offer superior heat resistance compared to traditional steel alternatives. At 1.0mm thickness, they provide better thermal insulation than thinner competitors, effectively slowing heat soak into the caliper assembly. FactionFab’s focus on material quality and precision manufacturing ensures these shims deliver reliable performance without compromising fitment or brake feel.

For Subaru WRX STI owners pushing their cars on the track, this simple yet effective upgrade helps prevent brake fluid boiling and fade, two common issues during sustained heavy braking. The result is improved brake consistency, enhanced safety margins, and longer-lasting brake components, making the FactionFab Titanium Brake Shim Set an essential addition for serious enthusiasts.

Features & Specifications

This FactionFab Titanium Rear Brake Shim Set is engineered for the 2018-2021 Subaru WRX STI and features 1.0mm thick Grade 5 titanium construction. Crafted from 6AL-4V titanium, it delivers superior thermal insulation to reduce heat transfer and prevent brake fade for Subaru enthusiasts seeking enhanced braking performance on the track.

• Brand: Faction Fab
• Product: Titanium Rear Brake Shim Set 2018-2021 STI
• Part Number: 1.10316.2
• Fitment: 2018-2021 Subaru WRX STI (FMSI D2118 Pads)
• Material: 6AL-4V / Grade 5 Titanium
• Finish: Natural titanium finish
• Construction: Precision laser-cut, 1.0mm thickness
• Origin: Not specified

Key Benefits

• Thermal Management: Reduces heat transfer from brake pads to caliper pistons, minimizing brake fade during intense driving.
• Durability: Titanium construction resists warping and corrosion, ensuring long-lasting performance under track conditions.
• Performance Consistency: Helps maintain stable brake fluid temperatures for reliable pedal feel and stopping power lap after lap.
• Brake Pad Longevity: Limits heat soak into pads, extending their usable life and reducing replacement frequency.
• Fitment Precision: Designed specifically for FMSI D2118 pads used on 2018-2021 STI rear brakes for a perfect fit.
• Track Compliance: Qualifies for most SCCA and NASA classes, supporting competitive motorsport use.

What's Included

• 4× FactionFab Titanium Rear Brake Shims (1.0mm thickness)

Installation & Compatibility

Installation of the FactionFab Titanium Rear Brake Shim Set is straightforward for anyone familiar with brake pad replacement. The shims fit directly between the brake pad backing plate and caliper piston, requiring no modifications or special tools beyond standard brake service equipment. While this is a DIY-friendly upgrade, professional installation is recommended if you are not comfortable working on brake components. Always ensure proper brake system bleeding and inspection after installation.

• Professional Installation: Recommended for safety and proper brake system handling
• Modifications Required: None; direct fit for FMSI D2118 pads
• Verify Compatibility: Confirm fitment for 2018-2021 Subaru WRX STI rear brakes using FMSI D2118 pads

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