Dorman M390430 Brake Master Cylinder

Reliable Brake Master Cylinder for Ford, Lincoln, and Mercury Vehicles

The Dorman M390430 brake master cylinder is engineered to restore proper brake hydraulics in select Ford, Lincoln, and Mercury models. Designed with precision, this master cylinder ensures consistent brake fluid pressure for safe and responsive braking performance.

Key Features of the Dorman M390430 Brake Master Cylinder

• Constructed from durable aluminum for corrosion resistance and longevity
• Includes an integrated reservoir for brake fluid storage
• Equipped with a sensor to monitor brake system status
• Features a 1-inch master cylinder bore diameter for optimal hydraulic pressure
• Three outlets with specific thread sizes: rearward outlet M10 x 1.0 & 3/8-24, secondary outlet M18 x 1.0

Detailed Product Description

This Dorman brake master cylinder (part number M390430) is designed specifically for use in Ford Crown Victoria, Lincoln Town Car, and Mercury Grand Marquis models. The aluminum construction provides a lightweight yet robust component that resists corrosion and wear. The included reservoir allows for proper brake fluid containment, while the integrated sensor helps maintain system integrity by detecting fluid levels or pressure changes. With a 1-inch bore diameter, this master cylinder delivers consistent hydraulic pressure to the braking system. The three outlet ports with precise thread sizes ensure compatibility with the vehicle’s brake lines, facilitating a secure and leak-free connection.

Common Applications and Issues Addressed

• Restores brake fluid pressure in vehicles experiencing spongy or unresponsive brakes
• Replaces master cylinders with leaking or damaged reservoirs
• Resolves brake warning light activation due to sensor faults
• Addresses brake fluid contamination or internal seal failure
• Improves overall brake system reliability in Ford Crown Victoria, Lincoln Town Car, and Mercury Grand Marquis

Installation Notes and Tips

• Ensure brake fluid reservoir is properly filled and free of contaminants before installation
• Bleed the brake system thoroughly after installation to remove air pockets
• Verify thread compatibility with existing brake lines using the specified outlet sizes
• Inspect sensor connections for secure fit and proper operation
• Consult vehicle service manual for torque specifications and installation procedures

Quality Assurance and Warranty Information

Dorman manufactures this brake master cylinder to meet or exceed OEM standards for fit and function. The aluminum construction and integrated sensor contribute to reliable brake system performance. While specific warranty details are not provided here, Dorman typically offers limited warranties on their replacement parts to ensure customer confidence and product durability.