Dorman M631022 Brake Master Cylinder

Reliable Brake Master Cylinder for Infiniti EX35, EX37, QX50

The Dorman M631022 brake master cylinder is engineered to restore proper brake hydraulics in your Infiniti EX35, EX37, or QX50. Designed with durable aluminum construction, this master cylinder ensures consistent brake fluid pressure for safe and responsive braking performance.

• Constructed from lightweight, corrosion-resistant aluminum
• Features a 1-inch master cylinder bore diameter for precise hydraulic control
• Includes three outlets with two rearward outlets sized M12 x 1.0
• Equipped with a removable reservoir type for easy maintenance
• Designed with two mounting holes for secure installation

Product Details and Specifications

The Dorman M631022 brake master cylinder is a direct replacement part specifically compatible with Infiniti EX35, EX37, and QX50 models. It does not include mounting hardware, brake booster, reservoir, push rod, bleeder hoses, sensors, or mounting brackets, so these components must be sourced separately if needed. The master cylinder features a 1-inch bore diameter, which is critical for maintaining proper hydraulic pressure within the brake system. Its aluminum material offers durability and resistance to corrosion, extending the service life of the component. The unit has three outlets, including two rearward outlets with M12 x 1.0 thread diameter, facilitating proper brake line connections. The removable reservoir design allows for easier brake fluid inspection and replacement.

Common Applications and Problem Resolution

• Restores brake fluid pressure in Infiniti EX35, EX37, and QX50 brake systems
• Replaces worn or leaking master cylinders causing brake pedal sponginess
• Addresses brake fluid leaks from the master cylinder body or seals
• Eliminates inconsistent brake pedal travel or poor braking response
• Supports brake system rebuilds requiring a new master cylinder

Installation Notes and Tips

When installing the Dorman M631022 brake master cylinder, ensure the brake system is properly bled to remove air and maintain hydraulic integrity. Since mounting hardware and other components are not included, verify compatibility and availability of necessary parts before installation. Use appropriate torque specifications for the two mounting holes to secure the unit firmly. Inspect brake lines and fittings for wear or damage during installation to prevent future leaks.

Quality Assurance and Warranty

Dorman manufactures the M631022 brake master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction provides corrosion resistance and durability under normal operating conditions. This part is backed by Dorman's limited warranty, ensuring reliability and performance for your Infiniti EX35, EX37, or QX50 brake system replacement needs.