Raybestos MC391365 Brake Master Cylinder

Reliable Brake Master Cylinder for BMW Models

The Raybestos Element3; New Brake Master Cylinder MC391365 is engineered to restore precise brake hydraulics for select BMW vehicles. Designed with durable aluminum construction and exact fitment specifications, this master cylinder ensures consistent brake performance for models like the BMW 328i and 335i.

• Constructed from lightweight, corrosion-resistant aluminum
• Two mounting holes with 0.354-inch diameter for secure installation
• Bore size of 0.875 inches for optimal hydraulic pressure
• Two ports with M12x1 thread size for primary and secondary connections
• Compatible with multiple BMW models including 130i, 135i, 323i, 328i xDrive, and X1

About the Raybestos Element3; New Product Line

The Element3; New line from Raybestos focuses on delivering reliable brake hydraulics components with precise engineering and durable materials. This brake master cylinder MC391365 is part of that line, offering a balance of performance and longevity through its aluminum construction and exact port threading. The Element3; New series is designed to meet or exceed OEM specifications for a range of BMW vehicles.

Detailed Product Description

This brake master cylinder features a 0.875-inch bore size, which is critical for maintaining proper hydraulic pressure in the brake system. The aluminum body provides resistance to corrosion and heat, contributing to the part's durability. With two mounting holes sized at 0.354 inches in diameter, installation is straightforward and secure. The master cylinder includes two ports, both threaded M12x1, allowing for reliable connection to the brake lines. This part number MC391365 is compatible with BMW models such as the 325i, 335is, and 330xi, ensuring a precise fit and proper brake function.

Common Applications and Issues Addressed

• Restores brake hydraulic pressure in BMW 130i and 135is models
• Replaces worn or leaking master cylinders in 328i xDrive and 335xi vehicles
• Solves brake pedal sponginess or sinking issues
• Addresses brake fluid leaks from the master cylinder ports
• Improves overall brake system responsiveness and safety

Installation Notes and Tips

Ensure the brake system is properly bled after installation to remove air and maintain hydraulic integrity. Verify that the mounting holes align correctly with the vehicle’s brake booster assembly. Use compatible brake fluid as specified by BMW manufacturer guidelines. Check the M12x1 port threads for any damage before connecting brake lines to prevent leaks.

Quality Assurance and Warranty

Raybestos manufactures the Element3; New MC391365 brake master cylinder to meet strict quality standards. The aluminum construction and precise machining contribute to long service life. While specific warranty details may vary, Raybestos products typically come with a limited warranty against defects in materials and workmanship, providing confidence in the part’s reliability for BMW brake system repairs.