Raybestos MC391421 Brake Master Cylinder

Reliable Brake Master Cylinder for Audi Models

The Raybestos Element3; New Brake Master Cylinder MC391421 is engineered to restore precise brake hydraulics for select Audi vehicles. Designed with durable aluminum construction and specific mounting features, this master cylinder ensures consistent brake performance for your Audi A4, A5, Q5, and their Quattro variants.

• Constructed from lightweight, corrosion-resistant aluminum
• Two mounting holes with 0.433-inch diameter for secure installation
• 1.125-inch bore size optimized for brake fluid pressure control
• Primary port thread size M12x1 and secondary port thread M14x1.5 for compatibility with OEM brake lines
• Compatible with Audi A4, A4 Quattro, A5, A5 Quattro, Q5, S4, S5, and SQ5 models

About the Raybestos Element3; New Product Line

The Element3; New line from Raybestos focuses on delivering reliable brake hydraulics components with modern materials and precise engineering. This brake master cylinder MC391421 benefits from the Element3; New design philosophy, featuring aluminum construction for improved durability and corrosion resistance compared to traditional cast iron units. The line targets direct replacement parts that meet or exceed OEM specifications for fit and function.

Detailed Product Description

This brake master cylinder is crafted from aluminum, providing a balance of strength and weight savings. It features two mounting holes with a diameter of 0.433 inches, ensuring a secure and exact fit on compatible Audi brake systems. The 1.125-inch bore size is designed to maintain proper hydraulic pressure for effective braking response. Threaded ports include a primary port with M12x1 threads and a secondary port with M14x1.5 threads, matching factory brake line fittings for straightforward installation. The MC391421 part number corresponds to this specific configuration, making it suitable for various Audi models including the A4, A5, Q5, and their performance variants.

Common Applications and Issues Addressed

• Restores brake hydraulic pressure for improved pedal feel
• Replaces worn or leaking master cylinders causing brake fluid loss
• Eliminates spongy or unresponsive brake pedal issues
• Addresses internal seal failures within the master cylinder
• Ensures proper brake fluid flow to front and rear brake circuits

Installation Notes and Tips

• Verify compatibility with your specific Audi model and year before installation
• Bleed the brake system thoroughly after installation to remove air
• Use OEM or equivalent brake fluid to maintain system integrity
• Inspect brake lines and fittings for wear or damage during replacement
• Follow manufacturer torque specifications for mounting bolts

Quality Assurance and Warranty

Raybestos manufactures the MC391421 brake master cylinder to meet stringent quality standards, ensuring reliable performance and durability. The aluminum construction resists corrosion and wear over time. While specific warranty details may vary, Raybestos typically offers coverage against defects in materials and workmanship. Always consult product documentation or contact the manufacturer for exact warranty terms.