Raybestos MC391026 Brake Master Cylinder

Reliable Brake Master Cylinder for Chevrolet and GMC Vans

The Raybestos Element3; New Brake Master Cylinder MC391026 is engineered to restore precise brake hydraulics for Chevrolet Express 3500 and GMC Savana 3500 models. Designed with durable aluminum construction and exact fitment specifications, this master cylinder ensures consistent braking performance.

• Constructed from lightweight, corrosion-resistant aluminum
• Two mounting holes with 0.413-inch diameter for secure installation
• 37.000 mm bore size optimized for brake fluid pressure control
• Two ports with 1/2"-20 thread size for primary and secondary brake lines
• Compatible with Chevrolet Express 3500 and GMC Savana 3500

About the Raybestos Element3; New Product Line

The Element3; New line from Raybestos focuses on delivering reliable brake hydraulics components with precise engineering and quality materials. This brake master cylinder MC391026 is part of that line, offering a balance of durability and performance tailored for heavy-duty vans like the Chevrolet Express 3500 and GMC Savana 3500. The aluminum master cylinder material reduces weight while maintaining strength, contributing to overall vehicle safety and brake system efficiency.

Technical Details and Specifications

This brake master cylinder features a 37.000 mm bore size, which is critical for maintaining proper hydraulic pressure in the brake system. The two mounting holes, each with a diameter of 0.413 inches, provide a secure and stable fit. Both the primary and secondary ports use a 1/2"-20 thread size, ensuring compatibility with standard brake line fittings. The aluminum construction offers resistance to corrosion and heat, extending the service life of the part under demanding conditions.

Common Applications and Problem Resolution

• Restores brake fluid pressure in Chevrolet Express 3500 and GMC Savana 3500
• Replaces worn or leaking master cylinders causing brake pedal sponginess
• Solves issues related to inconsistent braking or brake failure warnings
• Addresses master cylinder seal leaks and internal fluid bypass
• Improves brake system responsiveness and safety

Installation Notes and Tips

Ensure the vehicle is securely lifted and supported before beginning installation. Carefully remove the old master cylinder and inspect brake lines for wear or damage. Use the two 0.413-inch mounting holes to align the new master cylinder properly. Thread sizes of 1/2"-20 on both ports require compatible brake line fittings. After installation, bleed the brake system thoroughly to remove air and verify proper brake pedal feel.

Quality Assurance and Warranty

Raybestos manufactures the MC391026 brake master cylinder to meet or exceed OEM specifications. The aluminum material and precise bore size contribute to long-term durability. While specific warranty details are not provided here, Raybestos products typically come with a limited warranty against defects in materials and workmanship. Consult product documentation or the manufacturer for exact warranty terms.