Raybestos MC390186 Brake Master Cylinder

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

The Raybestos Element3; New Brake Master Cylinder MC390186 is engineered to restore precise brake hydraulics in select Buick, Cadillac, Oldsmobile, and Pontiac models. Designed with durable aluminum construction and specific port threading, this master cylinder ensures consistent brake fluid control and system integrity.

• Constructed from lightweight, corrosion-resistant aluminum
• Features a 1.000-inch bore size for accurate hydraulic pressure
• Includes 2 mounting holes with 0.413-inch diameter for secure installation
• Equipped with 4 ports: primary port thread M10x1 and secondary port thread M12x1
• Compatible with multiple GM models including Buick LeSabre, Cadillac DeVille, and Pontiac Bonneville

About the Raybestos Element3; New Product Line

The Element3; New line from Raybestos focuses on delivering reliable brake hydraulics components with precise engineering and material quality. This brake master cylinder is part of that line, offering aluminum construction and exact port threading specifications to meet OEM requirements for various GM vehicles. The Element3; New series is designed to provide consistent performance and durability in brake system applications.

Detailed Product Description

This Raybestos MC390186 brake master cylinder is crafted from aluminum to resist corrosion and reduce weight, contributing to overall vehicle efficiency. The 1.000-inch bore size is calibrated to provide the correct hydraulic pressure for smooth brake operation. With two mounting holes sized at 0.413 inches in diameter, installation is secure and stable. The master cylinder includes four ports, with primary and secondary port threads of M10x1 and M12x1 respectively, ensuring compatibility with brake lines and fittings on compatible Buick, Cadillac, Oldsmobile, and Pontiac models.

Common Applications and Issues Addressed

• Restores brake fluid pressure in Buick 60 Special and LeSabre models
• Replaces worn or leaking master cylinders in Cadillac DeVille and Fleetwood
• Solves brake pedal sponginess or failure in Oldsmobile 88 and 98 series
• Addresses brake fluid leaks in Pontiac Bonneville and Riviera
• Improves brake system responsiveness on GM Commercial Chassis vehicles

Installation Notes and Tips

• Ensure compatibility with vehicle make and model before installation
• Bleed the brake system thoroughly after installation to remove air
• Use proper torque specifications on mounting bolts to avoid damage
• Inspect brake lines and fittings for wear or damage during replacement
• Follow manufacturer guidelines for brake fluid type and maintenance

Quality Assurance and Warranty

Raybestos manufactures the MC390186 brake master cylinder to meet strict quality standards, using durable aluminum material and precise machining. This part is designed to match OEM specifications for reliable brake system performance. Warranty details are provided by Raybestos and typically cover defects in material and workmanship under normal use conditions.