Raybestos MC391006 Brake Master Cylinder

Brake Master Cylinder Overview

Raybestos MC391006 is a brake master cylinder for select Toyota Yaris applications. It is part of the Element3; New line and is built with an aluminum body, a 0.813 bore, and two M10x1 ports for a direct hydraulic connection.

Key Features

• Aluminum master cylinder construction for a lightweight, corrosion-resistant housing.
• 0.813 bore size for consistent hydraulic pressure transfer.
• Two-port design with M10x1 primary and secondary threads.
• Two mounting holes with a 0.354 diameter for proper installation alignment.
• Raybestos MC391006 for brake hydraulic service on select Toyota Yaris models.

Detailed Description

Raybestos MC391006 is a replacement brake master cylinder engineered for 2007-2009 Toyota Yaris applications. The aluminum construction helps reduce weight while maintaining the structural integrity needed in the brake hydraulic system. With a 0.813 bore, two ports, and M10x1 thread specifications, this master cylinder is configured for the vehicle’s brake line connections and hydraulic operation. The Element3; New product line identifies a new replacement offering within Raybestos brake hydraulics, and MC391006 is a fitment-specific option for Yaris brake system service.

Common Issues This Part Can Address

• Loss of brake pedal pressure caused by internal master cylinder wear.
• Brake fluid leakage from the master cylinder body or ports.
• Uneven or inconsistent hydraulic response during braking.
• Brake pedal travel that increases as hydraulic seals deteriorate.
• Brake system performance concerns tied to a failing master cylinder.

Installation Notes and Tips

Verify port thread size, bore size, and mounting hole layout before installation. After replacement, bleed the brake system thoroughly to remove trapped air and restore proper pedal feel. Confirm that the brake lines and sealing surfaces are clean and undamaged before connecting the new unit. Fits 2007-2009 Toyota Yaris, N/A.

Quality Assurance

Raybestos brake hydraulics are built to meet replacement-service expectations for fit and function. This part cross-references Centric Parts (e.g., 130.44125) for the same application.