Cusco Brake Master Cylinder

Fitment: 2004 - 2007 Subaru Impreza WRX / STI

Part #: 666 561 ALHD

Overview

The Cusco Brake Master Cylinder is a high-performance upgrade engineered specifically for Subaru Impreza WRX and STI models from 2004 to 2007. Designed to improve braking response and stability, this component helps deliver a more confident pedal feel during aggressive driving, spirited street use, or track days. Crafted with precision and durability in mind, it supports your vehicle’s braking system by reducing flex and maintaining consistent hydraulic pressure, ensuring optimal braking performance under demanding conditions. This master cylinder is ideal for enthusiasts seeking enhanced braking control and reliability. Whether you’re upgrading for improved safety or aiming to optimize your vehicle’s handling during high-speed driving, this part provides a significant upgrade over stock components. Its robust construction and innovative design help maintain consistent brake feel, contributing to safer and more predictable stopping power.

Key Features

This Cusco Brake Master Cylinder features advanced engineering aimed at maximizing braking efficiency and driver confidence. Its key features include:

• Precision-machined aluminum construction for strength and lightweight performance
• Cusco’s Brake Cylinder Stopper technology to minimize flex and maintain pedal firmness
• Enhanced hydraulic stability for consistent braking response
• Designed specifically for Subaru Impreza WRX and STI models from 2004 to 2007
• Improved pedal feel and modulation during aggressive driving
• Durable finish resistant to corrosion and wear

Construction & Design

The master cylinder is crafted from high-quality aluminum, ensuring both strength and lightweight performance. Its design incorporates Cusco’s proprietary Brake Cylinder Stopper technology, which helps reduce unwanted flex during braking, leading to more precise pedal feedback and improved overall braking response. The component’s robust construction is built to withstand the rigors of spirited driving and track use, maintaining performance over time.

Driving Feel & Feedback

This upgrade enhances the vehicle’s braking feel by providing a more direct and firm pedal response. The reduction in flex and improved hydraulic stability translate into better modulation and control, especially during high-stress braking scenarios. Drivers will notice a more predictable and confident stopping experience, contributing to safer driving dynamics.

Installation & Fitment

Installation requires basic mechanical skills and should be performed with standard automotive tools. Proper fitment verification against the vehicle’s specifications is recommended to ensure compatibility. The upgrade is designed as a direct replacement for the stock master cylinder on compatible Subaru Impreza WRX and STI models from 2004 to 2007, offering a straightforward bolt-on process.

What’s Included

The package includes the Cusco Brake Master Cylinder and all necessary mounting hardware for a secure installation. Additional components or accessories are not included but are typically part of the vehicle’s existing braking system.