Dorman M630939 Brake Master Cylinder

Overview of Dorman Brake Master Cylinder M630939

The Dorman Brake Master Cylinder M630939 is designed specifically for Hyundai Optima and Kia Sonata models. This brake hydraulics component ensures reliable brake fluid pressure and consistent braking performance for your vehicle.

• Master cylinder bore diameter: 0.875 inches
• Constructed from durable cast iron material
• Includes a removable reservoir for easy maintenance
• Equipped with a sensor for brake fluid level monitoring
• Two outlets with M12 x 1.0 thread pitch for secure connections
• Package contains the master cylinder only; mounting hardware not included

Detailed Product Description

The Dorman M630939 brake master cylinder is engineered with a cast iron body to provide strength and durability under demanding braking conditions. Its 0.875-inch bore diameter is calibrated to deliver precise hydraulic pressure to the brake system. The included removable reservoir simplifies fluid checks and refills, while the integrated sensor helps monitor brake fluid levels to alert drivers of potential issues. Featuring two outlets with M12 x 1.0 thread pitch, this master cylinder ensures compatibility with the brake lines on Hyundai Optima and Kia Sonata vehicles. Note that mounting hardware is not included, so existing hardware should be reused or sourced separately.

Compatible Vehicles and Applications

This brake master cylinder is compatible with the following vehicles:

• Hyundai Optima
• Kia Sonata

It is designed to replace the original equipment part and restore proper brake hydraulics function, addressing common brake system issues.

Common Issues Addressed by This Master Cylinder

• Brake pedal sinking or sponginess due to internal leaks
• Brake fluid leaks from the master cylinder reservoir or outlets
• Inconsistent brake pressure affecting stopping performance
• Brake warning light activation related to fluid level sensor faults
• Corrosion or wear in the original cast iron master cylinder body

Installation Notes and Tips

• Ensure the brake system is properly bled after installation to remove air
• Reuse or replace mounting hardware as needed since it is not included
• Verify sensor connector compatibility with vehicle wiring harness
• Inspect brake lines for damage before reconnecting to the new master cylinder
• Follow manufacturer torque specifications for outlet fittings (M12 x 1.0 thread pitch)

Quality Assurance and Warranty

Dorman manufactures this brake master cylinder to meet or exceed OEM specifications for Hyundai and Kia vehicles. The cast iron 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 cover defects in materials and workmanship.