Dorman M630913 Brake Master Cylinder

Reliable Brake Master Cylinder for Buick and Chevrolet Models

The Dorman M630913 brake master cylinder is engineered to restore proper brake hydraulics in select Buick and Chevrolet vehicles. Designed with durable cast iron and precise bore dimensions, this master cylinder ensures consistent brake fluid pressure for safe stopping performance.

• Master cylinder bore diameter: 0.9375 inches for accurate hydraulic control
• Constructed from cast iron for strength and durability
• Includes two outlets with M12 x 1.0 thread pitch for secure brake line connections
• Remote reservoir type design (reservoir not included)
• Compatible with Buick Encore, Chevrolet Sonic, and Chevrolet Trax models

Product Details and Specifications

The Dorman M630913 brake master cylinder features a cast iron body that withstands the rigors of brake system pressure and heat. Its 0.9375-inch bore diameter is calibrated to provide consistent hydraulic force to the brake calipers or wheel cylinders. This master cylinder includes two outlets, both with M12 x 1.0 thread pitch, allowing for reliable brake line attachment. The remote reservoir design means the brake fluid reservoir is mounted separately, which is common in many Buick Encore and Chevrolet Sonic brake systems. Note that the reservoir and mounting hardware are not included with this part.

Compatible Vehicles and Applications

This brake master cylinder is specifically compatible with the following vehicles:

• Buick Encore
• Chevrolet Sonic
• Chevrolet Trax

When searching for a replacement brake master cylinder for these models, referencing part number M630913 ensures proper fit and function.

Common Brake System Issues Addressed

• Spongy or unresponsive brake pedal
• Brake fluid leaks from the master cylinder
• Reduced braking efficiency or uneven brake pressure
• Brake warning light activation due to hydraulic failure
• Contaminated or damaged master cylinder bore

Installation Notes and Tips

Installation of the Dorman M630913 brake master cylinder requires careful brake system bleeding to remove air and ensure proper hydraulic pressure. Since the reservoir is not included, verify the condition of the existing reservoir before installation. Use appropriate tools to avoid damaging the M12 x 1.0 threaded outlets during brake line connection. Professional installation is recommended for safety and optimal brake performance.

Quality Assurance and Warranty

Dorman brake master cylinders are manufactured to meet or exceed OEM specifications, providing reliable performance and durability. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in materials and workmanship. Refer to Dorman’s official warranty policy for complete information.