Dorman M630885 Brake Master Cylinder

Reliable Brake Master Cylinder for Ford F-250 and F-350 Super Duty

The Dorman M630885 Brake Master Cylinder is engineered to restore proper brake hydraulics for Ford F-250 Super Duty, F-350, and F-350 Super Duty models. Designed with durable cast iron and a removable reservoir, this master cylinder ensures consistent braking performance and safety.

• Master cylinder bore diameter: 1.313 inches for precise hydraulic pressure
• Constructed from cast iron for strength and durability
• Includes a removable reservoir for easy maintenance
• Equipped with two outlets and a sensor for accurate brake fluid monitoring
• Secondary outlet thread diameter: 12 mm; rearward outlet size: M14 x 1.5 with 1.5 thread pitch
• Package includes the master cylinder; mounting hardware not included

Detailed Product Features and Specifications

The Dorman M630885 brake master cylinder is specifically designed for Ford F-250 Super Duty, F-350, and F-350 Super Duty trucks, providing a direct replacement for the original equipment. Its 1.313-inch bore diameter ensures proper hydraulic pressure for effective braking. The cast iron construction offers long-lasting durability under demanding conditions. The included removable reservoir simplifies brake fluid inspection and replacement, while the integrated sensor helps monitor fluid levels to maintain system integrity. With two outlets and precise thread specifications (secondary outlet thread diameter of 12 mm and rearward outlet size of M14 x 1.5), this master cylinder fits seamlessly into the brake hydraulic system of compatible Ford Super Duty models.

Common Applications and Problem Resolution

• Restores brake pressure and pedal feel in Ford F-250 and F-350 Super Duty trucks
• Replaces leaking or damaged master cylinders causing brake fluid loss
• Solves issues with inconsistent brake pedal response or sponginess
• Addresses sensor-related brake fluid level warnings
• Improves overall brake system reliability and safety

Installation Notes and Tips

Installation of the Dorman M630885 master cylinder requires basic mechanical skills and brake system knowledge. Since mounting hardware is not included, retain original mounting components or acquire compatible hardware separately. Ensure the brake system is properly bled after installation to remove air and restore full hydraulic function. The removable reservoir design facilitates fluid replacement during installation. Verify sensor connections to maintain accurate brake fluid monitoring.

Quality Assurance and Warranty Information

Dorman manufactures the M630885 brake master cylinder to meet or exceed OEM specifications for Ford Super Duty trucks. The cast iron material and precise engineering contribute to reliable performance and durability. This part includes a sensor to support brake system diagnostics. Warranty coverage details should be confirmed at the time of purchase, as they may vary by distributor.