Raybestos MC391317 Brake Master Cylinder

Reliable Brake Master Cylinder for Lexus GS and IS Models

The Raybestos Element3; New Brake Master Cylinder MC391317 is engineered to restore precise brake hydraulics for select Lexus vehicles. Designed with durable aluminum construction and exact fitment specifications, this master cylinder supports consistent braking performance for Lexus GS300, GS350, GS430, GS460, IS250, IS350, and IS F models.

• Constructed from lightweight, corrosion-resistant aluminum
• Two mounting holes with 0.354-inch diameter for secure installation
• 0.875-inch bore size optimized for brake fluid pressure control
• Two ports with M10x1 thread size for primary and secondary brake lines
• Compatible with multiple Lexus GS and IS series vehicles

Product Line: Raybestos Element3; New

The Element3; New line by Raybestos focuses on delivering reliable brake hydraulics components with modern materials and precise engineering. This brake master cylinder is part of that line, offering enhanced durability and fitment accuracy for Lexus brake systems. The aluminum master cylinder material contributes to reduced weight and improved corrosion resistance compared to traditional cast iron units.

Technical Details and Specifications

The MC391317 brake master cylinder features a 0.875-inch bore size, which is critical for maintaining proper hydraulic pressure within the brake system. It includes two mounting holes, each with a diameter of 0.354 inches, ensuring a secure and stable fit on compatible Lexus models. Both the primary and secondary ports use M10x1 threading, allowing for straightforward connection to brake lines. The aluminum construction provides a balance of strength and resistance to corrosion, supporting long-term reliability in brake hydraulics.

Applications and Problem Solving

• Restores brake fluid pressure for Lexus GS300, GS350, GS430, GS460, IS250, IS350, and IS F
• Replaces worn or leaking master cylinders causing brake pedal sponginess
• Addresses brake fluid leaks from damaged or corroded master cylinders
• Improves brake system responsiveness and safety
• Supports consistent brake performance under varied driving conditions

Installation Notes and Tips

Ensure the mounting holes align precisely with the vehicle’s brake booster or firewall mounting points. Verify that the M10x1 threaded ports match the brake line fittings to avoid leaks. Properly bleed the brake system after installation to remove air and restore full hydraulic pressure. Use recommended brake fluid compatible with Lexus specifications.

Quality Assurance and Warranty

Raybestos Element3; New brake master cylinders are manufactured to meet or exceed OEM standards for fit, form, and function. The aluminum construction is tested for durability and corrosion resistance. While specific warranty details are not provided here, Raybestos products typically come with a limited warranty covering defects in materials and workmanship.