Dorman M630974 Brake Master Cylinder

Reliable Brake Master Cylinder Replacement

The Dorman M630974 brake master cylinder is engineered to restore proper brake hydraulics performance for compatible vehicles. Designed with a durable cast iron construction, this master cylinder ensures consistent braking pressure and reliable operation for your vehicle's brake system.

• Cast iron master cylinder material for durability
• Integral reservoir included for fluid storage
• Master cylinder bore diameter of 1.125 inches
• Includes push rod and master cylinder cap
• Two mounting holes for secure installation
• Single outlet with rearward outlet size of 7/16-24 inches
• Pedal rod inner diameter of 9 mm

Product Details and Specifications

The Dorman M630974 brake master cylinder features a 1.125-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. It comes with an integral reservoir to hold brake fluid, eliminating the need for a separate reservoir. The unit includes a push rod and master cylinder cap, but does not include mounting hardware, brake booster, bleeder hoses, sensors, or mounting brackets. The master cylinder mounts with two holes and has a single rearward outlet sized at 7/16-24 inches, designed to connect seamlessly with your vehicle's brake lines.

Compatible Vehicles and Applications

This Dorman brake master cylinder is compatible with various vehicle makes and models requiring a 1.125-inch bore diameter master cylinder with an integral reservoir and single outlet configuration. It is commonly used in brake hydraulic systems where a cast iron master cylinder is specified. For exact fitment, verify compatibility with your vehicle's year, make, and model using the part number M630974.

Common Brake System Issues Addressed

• Brake pedal feels spongy or sinks to the floor
• Brake fluid leaks from the master cylinder or reservoir
• Reduced braking performance or inconsistent brake pressure
• Brake warning light illuminated due to hydraulic failure
• Corroded or damaged master cylinder body affecting brake function

Installation Notes and Tips

When installing the Dorman M630974 master cylinder, ensure the brake system is properly bled to remove air and restore hydraulic pressure. Use the two mounting holes to securely fasten the unit to the vehicle's firewall or mounting bracket. Since mounting hardware is not included, retain or source the appropriate bolts and fasteners. Verify that the push rod length and pedal rod inner diameter (9 mm) match your vehicle's specifications. Check all brake line connections, especially the 7/16-24 inch rearward outlet, for proper fit and sealing.

Quality Assurance and Warranty

Dorman manufactures this 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 supplier for exact warranty terms related to part number M630974.