Dorman M630359 Brake Master Cylinder

Reliable Brake Master Cylinder for Subaru Legacy and Outback

The Dorman M630359 brake master cylinder is engineered to restore proper brake hydraulics for Subaru Legacy and Outback models. Designed with precision, this master cylinder includes essential components to ensure consistent braking performance and safety.

• Includes brake booster and master cylinder cap for complete assembly
• Constructed from durable aluminum for corrosion resistance
• Features a removable reservoir with sensor for fluid monitoring
• Two mounting holes and dual outlets with M12 x 1.0 thread size
• Comes with a bleeder kit for easier brake system maintenance

Product Details and Specifications

The Dorman M630359 brake master cylinder is specifically designed for Subaru Legacy and Outback vehicles, providing a direct replacement for the original part. Its aluminum construction offers strength and longevity, while the included brake booster and master cylinder cap ensure a ready-to-install unit. The master cylinder bore diameter measures 1.0625 inches, supporting optimal hydraulic pressure. This unit features two outlets with M12 x 1.0 thread pitch, compatible with the vehicle’s brake lines. The removable reservoir includes a sensor to monitor brake fluid levels, enhancing safety and maintenance awareness. Although mounting hardware and push rod are not included, the package contains the master cylinder and a bleeder kit to facilitate proper brake system bleeding.

Common Applications and Problem Resolution

• Restores brake pressure loss due to worn or leaking master cylinder
• Replaces faulty brake fluid reservoir or sensor issues
• Addresses brake booster integration problems in Subaru Legacy and Outback
• Solves brake pedal sponginess caused by internal cylinder wear
• Improves brake system reliability after component failure

Installation Notes and Tips

Installation requires removal of the old master cylinder and careful connection of brake lines to the two outlets with M12 x 1.0 threads. The included bleeder kit assists in removing air from the brake system to ensure proper hydraulic function. Since mounting hardware and push rod are not included, reuse existing components or source separately. Verify the sensor connection for accurate brake fluid level monitoring. Proper torque specifications should be followed to avoid leaks or damage.

Quality Assurance and Warranty

Dorman manufactures this brake master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction and integrated components are designed for durability and consistent performance. While specific warranty details are not provided here, Dorman typically offers limited warranties on their brake hydraulics products to cover defects in materials and workmanship.