Dorman M630878 Brake Master Cylinder

Reliable Brake Master Cylinder for Volvo Models

The Dorman M630878 brake master cylinder is engineered to restore proper brake hydraulics for select Volvo vehicles. Designed with an integrated brake booster and constructed from durable aluminum, this master cylinder ensures consistent braking performance for your Volvo S60, S80, V60, XC60, XC70, and XC90 models.

• Includes brake booster for enhanced braking assistance
• Aluminum master cylinder material for durability and corrosion resistance
• Two mounting holes for secure installation
• 1-inch bore diameter for precise hydraulic pressure control
• Two outlets with M12 x 1.0 thread size for rearward and secondary connections
• Removable reservoir type for easy maintenance
• Package includes master cylinder and bleeder kit

Product Details and Specifications

The Dorman M630878 brake master cylinder features a 1-inch bore diameter that provides reliable hydraulic pressure to the braking system. Its aluminum construction offers strength and resistance to corrosion, extending the service life of the component. This master cylinder comes with an integrated brake booster, which assists in reducing pedal effort and improving overall brake response. The unit includes two mounting holes for secure attachment and two outlets with M12 x 1.0 thread pitch, compatible with the brake lines on Volvo S60, S60 Cross Country, S80, V60, V60 Cross Country, XC60, XC70, and XC90 models. The removable reservoir design allows for easier brake fluid inspection and maintenance. The package also contains a bleeder kit to facilitate proper brake system bleeding during installation.

Compatible Volvo Models and Applications

• Volvo S60 and S60 Cross Country
• Volvo S80
• Volvo V60 and V60 Cross Country
• Volvo XC60, XC70, and XC90

This master cylinder is specifically designed for these Volvo models to ensure proper fitment and optimal braking system performance.

Common Brake System Issues Addressed

• Spongy or soft brake pedal feel
• Brake fluid leaks from the master cylinder
• Reduced braking power or inconsistent brake response
• Brake warning light activation due to hydraulic failure
• Brake booster malfunction affecting pedal effort

Installation Notes and Tips

Installation of the Dorman M630878 brake master cylinder requires careful attention to brake line connections and proper bleeding of the brake system. The included bleeder kit assists in removing air from the hydraulic lines to restore firm pedal feel. Note that mounting hardware, push rod, reservoir, bleeder hoses, sensor, and mounting bracket are not included and may need to be reused from the original assembly or sourced separately. Ensure all connections use the specified M12 x 1.0 thread pitch for secure fitting. It is recommended to follow the vehicle manufacturer’s service manual for torque specifications and installation procedures.

Quality Assurance and Warranty

Dorman manufactures this brake master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction and integrated brake booster are designed for durability and reliable performance. While specific warranty details are not provided here, Dorman typically offers limited warranties on their brake hydraulic components. Verify warranty coverage with the product documentation or supplier at the time of purchase.