Dorman M630853 Brake Master Cylinder

Reliable Brake Master Cylinder for Honda Civic

The Dorman M630853 brake master cylinder is engineered to restore proper brake hydraulics in your Honda Civic. Designed with precision, this aluminum master cylinder ensures consistent brake fluid pressure for safe and responsive braking performance.

• Compatible with Honda Civic models requiring a 0.9375-inch bore diameter master cylinder
• Constructed from durable aluminum for corrosion resistance and longevity
• Features two mounting holes for secure installation
• Includes two outlets with a rearward outlet thread size of M10 x 1.0 and a thread pitch of 1.0
• Removable reservoir type for ease of maintenance (reservoir not included)

Product Details and Specifications

The Dorman M630853 brake master cylinder is designed specifically for Honda Civic vehicles, providing a precise fit and reliable function. This part features a 0.9375-inch bore diameter, which is critical for maintaining proper hydraulic pressure in the brake system. The master cylinder is made from aluminum, offering a balance of strength and corrosion resistance. It includes two mounting holes to ensure a secure attachment to the brake booster or firewall. The unit has two outlets, with the secondary outlet thread diameter measuring 10 mm and a rearward outlet size of M10 x 1.0, both with a thread pitch of 1.0. Note that this master cylinder does not include mounting hardware, brake booster, reservoir, push rod, bleeder hoses, sensor, or mounting bracket.

Common Applications and Problem Resolution

• Restores brake fluid pressure in Honda Civic brake systems
• Replaces worn or leaking master cylinders causing brake pedal sponginess
• Addresses brake fluid leaks from the master cylinder body or seals
• Improves brake response and pedal feel in vehicles with degraded master cylinders
• Suitable for brake system rebuilds requiring a precise bore diameter and outlet configuration

Installation Notes and Tips

When installing the Dorman M630853 brake master cylinder, ensure the mounting surface is clean and free of debris. Use the two mounting holes to securely fasten the unit, but note that mounting hardware is not included and must be sourced separately. Since the reservoir is not included, transfer the existing reservoir or install a compatible replacement. Bleed the brake system thoroughly after installation to remove air and ensure proper hydraulic function. Verify thread sizes (M10 x 1.0) for brake line fittings to avoid compatibility issues.

Quality Assurance and Warranty

Dorman manufactures the M630853 brake master cylinder to meet or exceed OEM specifications for fit and function. The aluminum construction provides durability and resistance to corrosion, contributing to long service life. While specific warranty details are not provided here, Dorman typically offers limited warranties on their brake hydraulic components to cover defects in materials and workmanship.