Raybestos MC39954 Brake Master Cylinder

Reliable Brake Master Cylinder for Buick, Cadillac, Oldsmobile, and Pontiac

The Raybestos Element3; New Brake Master Cylinder MC39954 is engineered to restore precise brake hydraulics performance in select Buick, Cadillac, Oldsmobile, and Pontiac vehicles. Designed with durable aluminum construction and exact fitment specifications, this master cylinder ensures consistent braking response and safety.

• Constructed from lightweight, corrosion-resistant aluminum
• Features a 1.000-inch bore size for optimal hydraulic pressure
• Includes two mounting holes with a diameter of 0.413 inches for secure installation
• Equipped with two ports: primary port thread M12x1 and secondary port thread M10x1
• Compatible with Buick 88, Cadillac Commercial Chassis, Oldsmobile Delta 88, Pontiac Bonneville, and LeSabre models

About the Raybestos Element3; New Product Line

The Element3; New line from Raybestos focuses on delivering reliable brake hydraulics components that meet or exceed OEM specifications. This brake master cylinder is part of that line, offering precise engineering and material quality to maintain proper brake system function in classic and late-model vehicles. The aluminum master cylinder material contributes to durability and resistance to corrosion, supporting long-term performance.

Detailed Product Description

The MC39954 brake master cylinder is designed with a 1.000-inch bore size to provide the correct hydraulic pressure needed for effective braking. Its aluminum construction reduces weight while resisting rust and wear. The two mounting holes, each with a 0.413-inch diameter, ensure a secure fit to the vehicle’s brake system. The master cylinder includes two ports with specific thread sizes (M12x1 for the primary port and M10x1 for the secondary port), allowing compatibility with the brake lines of Buick 88, Cadillac Commercial Chassis, Oldsmobile Delta 88, Pontiac Bonneville, and LeSabre models.

Common Applications and Issues Addressed

• Restores brake hydraulic pressure in vehicles experiencing spongy or unresponsive brakes
• Replaces worn or leaking master cylinders causing brake fluid loss
• Solves inconsistent brake pedal feel due to internal cylinder wear
• Addresses brake system failure symptoms in Buick, Cadillac, Oldsmobile, and Pontiac models
• Supports maintenance of brake system integrity for safe vehicle operation

Installation Notes and Tips

Ensure the brake system is properly bled after installation to remove air and maintain hydraulic pressure. Verify that the mounting holes align correctly with the vehicle’s brake booster or firewall. Use compatible brake lines matching the M12x1 and M10x1 port threads to prevent leaks. Follow manufacturer torque specifications for mounting bolts to avoid damage or improper sealing.

Quality Assurance and Warranty

Raybestos Element3; New brake master cylinders are manufactured to meet OEM standards for fit, form, and function. The aluminum construction provides corrosion resistance and durability under normal operating conditions. While specific warranty details may vary, Raybestos products typically include coverage against defects in materials and workmanship to ensure reliability and customer confidence.