Dorman M12579 Brake Master Cylinder

Reliable Brake Master Cylinder for Mercury Quest and Nissan Villager

The Dorman M12579 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 and thread pitch of 1.0
• Does not include mounting hardware or reservoir, allowing compatibility with existing components
• Secondary outlet thread diameter: 10 mm for secure brake line connections
• Package contains the master cylinder only, part number M12579

Technical Details and Compatibility

This Dorman brake master cylinder (part number M12579) is specifically designed for use in Mercury Quest and Nissan Villager models. The 1-inch bore diameter provides the correct volume of brake fluid displacement to maintain hydraulic pressure. Made from aluminum, the master cylinder offers resistance to rust and wear, extending the service life of your brake system. The unit features two outlets, including a rearward outlet sized M10 x 1.0 with a 1.0 thread pitch, ensuring proper fitment with factory brake lines. Note that this product does not include a reservoir or mounting hardware, so it is intended for replacement where those components remain in good condition.

Common Applications and Problem Resolution

• Restores brake fluid pressure in Mercury Quest and Nissan Villager brake systems
• Replaces master cylinders with worn or damaged bores causing brake failure or spongy pedal feel
• Addresses leaks or internal seal failures within the master cylinder
• Improves brake responsiveness and pedal firmness
• Supports safe vehicle operation by maintaining proper hydraulic function

Installation Notes and Tips

When installing the Dorman M12579 brake master cylinder, ensure the brake fluid reservoir and mounting hardware are in good condition, as these are not included. Properly bleed the brake system after installation to remove air and restore hydraulic pressure. Verify that the outlet threads match your vehicle’s brake lines, particularly the M10 x 1.0 rearward outlet. Use appropriate tools to avoid damaging the aluminum body or threads during installation.

Quality Assurance and Warranty

Dorman manufactures the M12579 brake master cylinder to meet or exceed OEM specifications for Mercury Quest and Nissan Villager vehicles. The aluminum construction provides durability and corrosion resistance. While specific warranty details may vary, Dorman typically offers limited warranties covering defects in materials and workmanship. Refer to the product documentation for exact warranty terms.