Dorman M630722 Brake Master Cylinder

Reliable Brake Master Cylinder for BMW 525i, 530i, and X3

The Dorman M630722 Brake Master Cylinder is engineered to restore proper brake hydraulics in select BMW models. Designed with precision, this aluminum master cylinder offers consistent performance for the 525i, 530i, and X3 vehicles.

• Master cylinder bore diameter: 0.875 inches for accurate hydraulic pressure
• Constructed from durable aluminum material for corrosion resistance
• Includes two outlets with M12 x 1.0 thread size for secure brake line connections
• Rearward outlet and secondary outlet both feature M12 x 1.0 thread pitch
• Does not include reservoir or sensor, sold as master cylinder only

Product Details and Specifications

The Dorman M630722 brake master cylinder is designed specifically for BMW 525i, 530i, and X3 models, ensuring compatibility with the original brake system. Its 0.875-inch bore diameter provides the correct hydraulic pressure needed for effective braking. Manufactured from aluminum, this master cylinder offers resistance to rust and wear, contributing to long-term reliability. The unit features two outlets, both with M12 x 1.0 thread pitch, allowing for proper brake line attachment. Note that this part does not include a reservoir or sensor, so those components must be sourced separately if needed.

Common Applications and Problem Resolution

• Restores brake pressure in BMW 525i, 530i, and X3 models experiencing spongy or unresponsive brakes
• Replaces leaking or damaged master cylinders causing brake fluid loss
• Addresses brake pedal sinking or failure to maintain pressure
• Solves issues related to inconsistent brake performance due to worn internal components

Installation Notes and Tips

Installation of the Dorman M630722 brake master cylinder requires proper brake fluid handling and bleeding procedures to ensure system integrity. Since mounting hardware is not included, retain original fasteners or acquire appropriate replacements. Verify thread pitch compatibility (M12 x 1.0) with brake lines before installation. It is recommended to inspect the brake fluid reservoir and sensors separately, as these are not part of this assembly.

Quality Assurance and Warranty

Dorman manufactures this brake master cylinder to meet or exceed OEM standards for fit and function. The aluminum construction supports durability under typical operating conditions. While specific warranty details are not provided here, Dorman products generally come with a limited warranty covering defects in material and workmanship. Consult product documentation or the manufacturer for exact warranty terms.