Dorman M39855 Brake Master Cylinder

Reliable Brake Master Cylinder for Mitsubishi and Plymouth Vehicles

The Dorman M39855 brake master cylinder is engineered to restore proper brake hydraulics in select Mitsubishi and Plymouth models. 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 hydraulic control
• 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 reservoir or mounting hardware, allowing compatibility with existing components
• Compatible with Mitsubishi Eclipse, Galant, and Plymouth Laser models

Product Details and Specifications

The Dorman M39855 brake master cylinder is designed to meet the hydraulic requirements of specific Mitsubishi and Plymouth vehicles. Its 1-inch bore diameter provides the necessary volume displacement for effective brake pressure. Manufactured from aluminum, this master cylinder offers resistance to rust and wear, contributing to long-term reliability. The unit features two outlets, including a secondary outlet with a 10mm thread diameter and a rearward outlet sized M10 x 1.0, both with a 1.0 thread pitch, ensuring proper fitment with brake lines. This part does not come with a reservoir or mounting hardware, making it suitable for installations where these components are already in place or replaced separately.

Compatible Vehicles and Applications

• Restores brake hydraulic function in Mitsubishi Eclipse models
• Compatible with Mitsubishi Galant brake systems
• Fits Plymouth Laser brake hydraulic assemblies
• Ideal for addressing brake pressure inconsistencies or master cylinder failure
• Suitable for brake system rebuilds requiring a direct replacement master cylinder

Installation Notes and Tips

• Verify compatibility with your vehicle’s brake system before installation
• Ensure brake fluid reservoir and mounting hardware are available as they are not included
• Bleed the brake system thoroughly after installation to remove air pockets
• Use proper tools to avoid damaging the aluminum threads during installation
• Consult vehicle service manual for torque specifications and installation procedures

Quality Assurance and Warranty Information

Dorman manufactures the M39855 brake master cylinder to meet or exceed OEM standards for fit and function. The aluminum construction provides durability under normal operating conditions. While mounting hardware and reservoir are not included, the master cylinder itself is backed by Dorman’s quality control processes. Please refer to Dorman’s official warranty policy for coverage details.