Subaru OEM Brake Master to Clutch Master Hose (15-21 STI) | 37251FJ020

Overview

The Genuine Subaru Brake Master to Clutch Master Hose (Part #37251FJ020) is an OEM-spec hydraulic line designed to connect the brake master cylinder reservoir to the clutch master cylinder on 2015–2021 Subaru WRX STI models. Engineered and manufactured to Subaru's factory standards, this hose ensures proper hydraulic fluid transfer, reliable clutch engagement, and long-term durability you can count on. If you're experiencing a soft clutch pedal, fluid leaks, or visible hose degradation, replacing with a genuine Subaru part is the only way to restore factory performance.

Key Features & Benefits

• Genuine Subaru OEM Quality – Manufactured to exact factory specifications, ensuring a precise fit and reliable hydraulic performance with no modifications required.
• Exact-Fit Guarantee – Designed specifically for 2015–2021 Subaru WRX STI; no cutting, adapting, or guesswork during installation.
• Durable Construction – Built to withstand the high-pressure hydraulic environment of the clutch system, resisting cracking, swelling, and fluid degradation over time.
• Restores Factory Clutch Feel – Replacing a worn or leaking hose with this OEM part returns your clutch pedal to its original engagement feel and response.
• Factory Warranty Coverage – As a genuine Subaru part, it is backed by Subaru's OEM parts warranty when installed by an authorized dealer.
• Prevents Fluid Contamination – Maintains a sealed, leak-free hydraulic circuit between the brake master cylinder reservoir and clutch master cylinder.

What's Included

• 1x Genuine Subaru Brake Master to Clutch Master Hose (Part #37251FJ020)

Specifications

Fitment & Compatibility

This genuine Subaru hose is confirmed to fit the following vehicles:

Always verify your vehicle's VIN and production date when ordering OEM parts to confirm compatibility. This hose is specific to the STI's hydraulic clutch system and is not interchangeable with the standard WRX.

Installation

This is a direct OEM replacement hose. Installation involves disconnecting the existing hose from the brake master cylinder reservoir and clutch master cylinder, transferring to the new hose, and bleeding the clutch hydraulic system to remove any air. While mechanically inclined enthusiasts can perform this service at home, professional installation by a qualified Subaru technician is recommended to ensure proper bleeding and system integrity. Always use fresh DOT 3 or DOT 4 brake fluid as specified in your owner's manual.