Dorman M630919 Brake Master Cylinder

Reliable Brake Master Cylinder for BMW X3 and X4

The Dorman M630919 brake master cylinder is engineered to restore proper brake hydraulics in your BMW X3 or X4. Designed with durable cast iron construction, this master cylinder ensures consistent performance and longevity under demanding driving conditions.

• Master cylinder bore diameter: 1 inch for precise hydraulic pressure
• Constructed from cast iron for strength and durability
• Includes two outlets with M12x1.0 thread size for rearward and secondary connections
• Removable reservoir type (reservoir not included)
• Package contains the master cylinder only, no mounting hardware or sensors included

Durable Cast Iron Construction and Precise Specifications

The Dorman M630919 brake master cylinder features a 1-inch bore diameter, providing accurate hydraulic pressure control essential for the braking system of BMW X3 and X4 models. Its cast iron material offers resistance to wear and heat, contributing to reliable brake performance. The unit includes two outlets, both with M12x1.0 thread diameters, designed for secure connection to the brake lines. This master cylinder comes without a reservoir or sensor, allowing compatibility with existing components in your vehicle’s brake system.

Compatible Applications and Common Brake Issues Addressed

• Replacement for worn or leaking brake master cylinders on BMW X3 and X4
• Resolves spongy or unresponsive brake pedal feel
• Fixes brake fluid leaks from the master cylinder area
• Restores proper hydraulic pressure for consistent braking
• Addresses brake system failure symptoms related to master cylinder wear

Installation Notes and Tips

When installing the Dorman M630919 brake master cylinder, ensure the brake fluid reservoir is compatible and properly connected, as this unit does not include a reservoir. Bleed the brake system thoroughly after installation to remove air and restore optimal brake pedal feel. Verify that the M12x1.0 outlet threads match your vehicle’s brake line fittings for a secure connection. Professional installation is recommended to maintain brake system safety and performance.

Quality Assurance and Warranty Information

Dorman manufactures the M630919 brake master cylinder to meet or exceed OEM standards for fit and function on BMW X3 and X4 models. The cast iron construction and precise bore diameter contribute to dependable brake system operation. While specific warranty details are not provided here, Dorman products typically come with a limited warranty covering defects in materials and workmanship.