Raybestos MC390646 Brake Master Cylinder

Reliable Brake Master Cylinder for Chevrolet Cavalier and Pontiac Sunfire

The Raybestos Element3; New Brake Master Cylinder MC390646 is engineered to restore precise brake hydraulics for Chevrolet Cavalier and Pontiac Sunfire 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 0.433-inch diameter for secure installation
• Bore size of 0.875 inches for optimal hydraulic pressure
• Two ports with M11x1.5 primary and M12x1 secondary port threads
• Compatible with Chevrolet Cavalier and Pontiac Sunfire vehicles

Detailed Product Features and Specifications

This brake master cylinder features a robust aluminum body that resists corrosion and heat, contributing to long service life. The two mounting holes, each with a diameter of 0.433 inches, provide a stable and precise fit to the brake system. The 0.875-inch bore size is designed to deliver the correct hydraulic pressure needed for effective braking response. Additionally, the master cylinder includes two ports: a primary port with M11x1.5 threading and a secondary port with M12x1 threading, ensuring compatibility with the brake lines on Chevrolet Cavalier and Pontiac Sunfire models. The part number MC390646 identifies this specific configuration within the Raybestos lineup.

About the Raybestos Element3; New Product Line

The Element3; New series by Raybestos focuses on delivering reliable brake hydraulics components with modern materials and precise engineering. This product line emphasizes durability and fitment accuracy, making it suitable for replacement brake master cylinders like the MC390646. The use of aluminum material in this line helps reduce weight while maintaining strength, aligning with the needs of vehicles such as the Chevrolet Cavalier and Pontiac Sunfire.

Common Applications and Problem Resolution

• Restores proper hydraulic pressure in brake systems
• Replaces worn or leaking master cylinders causing brake fluid loss
• Eliminates spongy or unresponsive brake pedal feel
• Addresses brake failure issues related to internal cylinder wear
• Ensures secure mounting with precise hole spacing and diameter

Installation Notes and Tips

When installing the Raybestos MC390646 brake master cylinder, ensure the mounting holes align correctly with the vehicle’s brake booster or firewall. Use the specified 0.433-inch diameter holes for secure attachment. Verify that the primary and secondary port threads (M11x1.5 and M12x1) match the brake line fittings to prevent leaks. Bleed the brake system thoroughly after installation to remove air and restore proper brake pedal feel. Consult the vehicle’s service manual for torque specifications and detailed installation procedures.

Quality Assurance and Warranty Information

Raybestos manufactures the MC390646 brake master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction and precise machining contribute to consistent performance and durability. This part is backed by Raybestos’ quality assurance processes, ensuring reliability for Chevrolet Cavalier and Pontiac Sunfire brake systems. Warranty coverage details can be obtained from the product documentation or authorized distributors.