Dorman M630780 Brake Master Cylinder

Overview of Dorman Brake Master Cylinder M630780

The Dorman Brake Master Cylinder M630780 is designed specifically for Jeep Grand Cherokee models, providing reliable brake hydraulics performance. Crafted from durable aluminum, this master cylinder ensures consistent braking pressure and long-lasting operation.

• Master cylinder bore diameter: 1.063 inches
• Constructed from aluminum for strength and corrosion resistance
• Includes two outlets with M12 x 1.0 thread size
• Rearward outlet and secondary outlet both sized M12 x 1.0
• Does not include mounting hardware, reservoir, or sensor
• Package contains the master cylinder only

Detailed Product Description

The Dorman M630780 brake master cylinder is engineered to meet the specific hydraulic requirements of Jeep Grand Cherokee vehicles. Its 1.063-inch bore diameter is optimized for proper brake fluid displacement, ensuring effective pressure transfer to the brake calipers and wheel cylinders. Made from aluminum, the master cylinder offers a balance of lightweight design and resistance to corrosion, which is critical for maintaining brake system integrity over time.

This master cylinder features two outlets, both with M12 x 1.0 thread pitch, allowing for secure and leak-free connections to the brake lines. Note that this unit does not include a reservoir or sensor, so it is intended for applications where those components are either already installed or replaced separately. The absence of mounting hardware means that existing hardware should be reused or sourced independently during installation.

Common Applications and Issues Addressed

• Replacement for worn or leaking brake master cylinders on Jeep Grand Cherokee models
• Resolves issues with inconsistent brake pedal feel or reduced braking efficiency
• Addresses internal seal failure causing brake fluid leaks
• Corrects master cylinder bore wear that leads to pressure loss
• Restores proper hydraulic pressure for safe braking performance

Installation Notes and Tips

• Ensure compatibility with your specific Jeep Grand Cherokee year and brake system before installation
• Reuse or replace mounting hardware as needed since it is not included
• Bleed the brake system thoroughly after installation to remove air and ensure proper function
• Inspect brake lines and fittings for wear or damage during installation
• Verify that the reservoir and sensor components are properly connected if applicable

Quality Assurance and Warranty

Dorman manufactures the M630780 brake master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction provides durability and corrosion resistance essential for brake system components. While specific warranty details should be confirmed at the point of purchase, Dorman typically offers limited warranties covering defects in materials and workmanship to ensure customer confidence in product reliability.