Raybestos MC390531 Brake Master Cylinder

Reliable Brake Master Cylinder for Ford Super Duty Trucks

The Raybestos Element3; New Brake Master Cylinder MC390531 is engineered to restore precise brake hydraulics in Ford F-250 Super Duty and F-350 Super Duty models. Designed with durable aluminum construction and exact fitment specifications, this master cylinder ensures consistent braking performance.

• Constructed from lightweight, corrosion-resistant aluminum
• Features a 1.375-inch bore size for optimal hydraulic pressure
• Includes two mounting holes with a 0.413-inch diameter for secure installation
• Equipped with two ports: primary port thread 7/16"-24 and secondary port thread 9/16"-18
• Compatible with Ford F-250 Super Duty and F-350 Super Duty models

Product Line Details: 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 through its aluminum body and carefully designed port threading to match factory specifications for Ford Super Duty trucks.

Technical Description and Specifications

This brake master cylinder (part number MC390531) is crafted from aluminum, providing a balance of strength and corrosion resistance essential for brake hydraulics. It features a bore size of 1.375 inches, which is critical for maintaining proper hydraulic pressure and brake fluid flow. The unit mounts securely with two holes, each 0.413 inches in diameter, ensuring a stable fit. It includes two ports with specific thread sizes—7/16"-24 for the primary port and 9/16"-18 for the secondary port—matching the brake line connections on Ford F-250 and F-350 Super Duty trucks.

Common Applications and Problem Resolution

• Restores brake hydraulic pressure in Ford F-250 Super Duty and F-350 Super Duty vehicles
• Replaces worn or leaking master cylinders causing brake fluid loss
• Addresses spongy or unresponsive brake pedal issues
• Solves brake system failure due to internal cylinder wear or corrosion
• Ensures proper brake fluid distribution to front and rear brakes

Installation Notes and Tips

When installing the Raybestos MC390531 brake master cylinder, ensure the mounting holes align precisely with the vehicle’s firewall or mounting bracket. Use the correct torque specifications for the mounting bolts to avoid leaks or misalignment. Bleed the brake system thoroughly after installation to remove air and restore proper hydraulic pressure. Verify that the port threads (7/16"-24 primary and 9/16"-18 secondary) match the brake lines to prevent cross-threading or leaks.

Quality Assurance and Warranty

Raybestos manufactures the Element3; New brake master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction offers resistance to corrosion and wear, contributing to long service life. While specific warranty details are not provided here, Raybestos products typically come with a limited warranty covering defects in materials and workmanship.