Dorman M390584 Brake Master Cylinder

Reliable Brake Master Cylinder for Mercury Quest and Nissan Villager

The Dorman M390584 brake master cylinder is engineered to restore proper brake hydraulics in your Mercury Quest or Nissan Villager. Designed with precision, this aluminum master cylinder ensures consistent brake fluid pressure for safe and effective braking performance.

• Master cylinder bore diameter: 1 inch for accurate fluid displacement
• Constructed from durable aluminum material for corrosion resistance
• Includes two outlets with a rearward outlet size of M10 x 1.0 thread pitch
• Secondary outlet thread diameter of 10 mm for secure brake line connections
• Package contains the master cylinder only; mounting hardware and reservoir are not included

Detailed Product Description

The Dorman M390584 brake master cylinder is specifically designed for use in Mercury Quest and Nissan Villager models, providing a direct replacement for the original equipment part. Its 1-inch bore diameter allows for precise hydraulic pressure control, essential for maintaining brake system integrity. Manufactured from aluminum, this master cylinder offers enhanced durability and resistance to corrosion compared to traditional cast iron units. The unit features two outlets, including a rearward outlet with an M10 x 1.0 thread pitch, ensuring compatibility with factory brake lines. Note that this product does not include a reservoir or mounting hardware, so these components must be sourced separately if needed.

Common Applications and Issues Addressed

• Restores brake fluid pressure in Mercury Quest and Nissan Villager brake systems
• Replaces worn or leaking master cylinders causing brake pedal sponginess
• Solves brake fluid leaks from damaged or corroded master cylinder bodies
• Addresses inconsistent braking performance due to internal seal failure
• Prevents brake system failure by maintaining proper hydraulic pressure

Installation Notes and Tips

• Ensure brake system is fully depressurized before removal
• Bleed the brake system thoroughly after installation to remove air
• Verify thread pitch (1.0) and outlet sizes for proper brake line fitment
• Use compatible brake fluid as specified by vehicle manufacturer
• Check for leaks and proper pedal feel before driving

Quality Assurance and Warranty

Dorman manufactures the M390584 brake master cylinder to meet or exceed OEM specifications for fit, form, and function. The aluminum construction provides long-lasting performance under normal operating conditions. While mounting hardware and reservoir are not included, the master cylinder itself is backed by Dorman's quality standards. Please consult Dorman's warranty policy for specific coverage details.