Dorman M631063 Brake Master Cylinder

Reliable Brake Master Cylinder for Volkswagen Vehicles

The Dorman M631063 brake master cylinder is engineered to restore proper brake hydraulics for Volkswagen Beetle, Golf SportWagen, and Jetta models. Designed with precision, this aluminum master cylinder ensures consistent brake fluid pressure for safe and responsive braking performance.

• Constructed from durable aluminum for corrosion resistance
• Master cylinder bore diameter of 0.875 inches for accurate fluid displacement
• Two mounting holes for secure installation
• Includes two outlets with rearward outlet size M12x1.0 and 12mm secondary outlet thread diameter
• Removable reservoir type for maintenance flexibility

Product Details and Specifications

The Dorman M631063 brake master cylinder is designed without a brake booster, push rod, reservoir, or mounting hardware, focusing solely on the core hydraulic component. Its aluminum construction provides strength and longevity under demanding brake system conditions. The master cylinder features a 0.875-inch bore diameter, which is critical for maintaining proper hydraulic pressure and brake pedal feel. With two outlets, including a rearward outlet sized M12x1.0 and a secondary outlet with a 12mm thread diameter, this part supports dual-circuit brake systems commonly found in Volkswagen Beetle, Golf SportWagen, and Jetta models. The removable reservoir type allows for easier servicing and fluid replacement.

Compatible Volkswagen Models and Applications

• Volkswagen Beetle brake master cylinder replacement
• Brake hydraulic repair for Volkswagen Golf SportWagen
• Brake master cylinder upgrade for Volkswagen Jetta

Common Brake Issues Addressed

• Brake pedal sinking or sponginess due to master cylinder wear
• Brake fluid leaks from a failing master cylinder
• Reduced braking efficiency or uneven brake pressure
• Brake warning light activation related to hydraulic failure
• Inconsistent brake pedal travel or responsiveness

Installation Notes and Tips

Installation of the Dorman M631063 brake master cylinder requires proper brake system bleeding to remove air and ensure optimal hydraulic function. Since mounting hardware and reservoir are not included, reuse existing components or source separately as needed. Verify compatibility with your specific Volkswagen model year and brake system configuration before installation. Professional installation is recommended to maintain brake system safety and performance.

Quality Assurance and Warranty

Dorman manufactures this brake master cylinder to meet or exceed OEM specifications for Volkswagen vehicles. The aluminum construction offers durability and resistance to corrosion. While specific warranty details are not provided here, Dorman products typically come with a limited warranty covering defects in materials and workmanship. Consult product documentation or the manufacturer for exact warranty terms.