Dorman M630985 Brake Master Cylinder

Reliable Brake Master Cylinder Replacement for Your Vehicle

The Dorman M630985 brake master cylinder is engineered to restore proper brake hydraulics performance in compatible vehicles. Designed with a durable cast iron construction and a removable reservoir, this master cylinder ensures consistent braking pressure and fluid management.

• Cast iron master cylinder material for durability
• Includes a removable reservoir for easy maintenance
• 1.75-inch bore diameter for precise hydraulic control
• Four mounting holes for secure installation
• Two outlets with rearward outlet size of 9/16-18 and secondary outlet thread diameter of 0.5 inches

Detailed Product Features and Specifications

The Dorman M630985 brake master cylinder features a 1.75-inch bore diameter, which is critical for maintaining proper hydraulic pressure in the brake system. Constructed from cast iron, this master cylinder offers strength and resistance to wear over time. It includes a removable reservoir, allowing for straightforward brake fluid inspection and replacement. The unit has four mounting holes to ensure a secure fit, and it provides two outlets to connect with the brake lines, including a rearward outlet sized at 9/16-18 and a secondary outlet with a 0.5-inch thread diameter. This part does not include mounting hardware, brake booster, push rod, bleeder hoses, sensors, or a mounting bracket.

Common Applications and Problem Resolution

• Restores brake pressure loss due to worn or leaking master cylinder
• Eliminates spongy or unresponsive brake pedal feel
• Resolves brake fluid leaks from the reservoir or cylinder body
• Addresses brake system failure caused by internal seal damage
• Improves overall brake system reliability and safety

Installation Notes and Tips

When installing the Dorman M630985 brake master cylinder, ensure the brake system is properly bled to remove air and maintain hydraulic integrity. Verify that the mounting surface is clean and free of debris before securing the unit with the four mounting holes. Since mounting hardware is not included, use the original or appropriate replacement bolts. Check compatibility with your specific vehicle make and model to confirm fitment. The removable reservoir facilitates fluid inspection during installation and maintenance.

Quality Assurance and Warranty Information

Dorman manufactures the M630985 brake master cylinder to meet or exceed OEM standards for fit, form, and function. The cast iron construction provides long-lasting durability under normal operating conditions. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in materials and workmanship. Consult product documentation or the manufacturer for exact warranty terms.