Dorman M630751 Brake Master Cylinder

Reliable Brake Master Cylinder for Audi A6, S4, RS6 Models

The Dorman M630751 brake master cylinder is engineered to meet the hydraulic braking needs of select Audi vehicles. Designed specifically for models including the Audi A6, A6 Quattro, RS4, RS6, S4, and S6, this master cylinder ensures consistent brake fluid pressure and reliable stopping power.

• Master cylinder bore diameter: 1.063 inches for precise hydraulic control
• Constructed from durable aluminum material for corrosion resistance
• Includes two outlets with M12 x 1.0 thread size for secure brake line connections
• Does not include reservoir or mounting hardware, allowing compatibility with existing components
• Package contains the master cylinder only, part number M630751

Technical Details and Compatibility

The Dorman M630751 brake master cylinder features a 1.063-inch bore diameter, which is critical for maintaining proper brake fluid pressure in the hydraulic system. Its aluminum construction offers strength and resistance to corrosion, extending the service life of the component. The unit includes two outlets, both with M12 x 1.0 thread pitch, designed to connect seamlessly with the brake lines on compatible Audi models. This master cylinder does not come with a reservoir or mounting hardware, so it is intended for use with existing parts or separate replacements.

Applications and Problem Resolution

This brake master cylinder is compatible with the following Audi vehicles: A6, A6 Quattro, RS4, RS6, S4, and S6. It is designed to address common brake system issues such as:

• Loss of brake fluid pressure leading to spongy brake pedal feel
• Brake fluid leaks from a worn or damaged master cylinder
• Inconsistent braking performance or delayed brake response
• Brake pedal sinking or failure to maintain pressure
• Replacement of a faulty or worn master cylinder to restore braking reliability

Installation Notes and Tips

When installing the Dorman M630751 brake master cylinder, ensure the brake fluid reservoir and mounting hardware are compatible and in good condition, as these are not included. Proper bleeding of the brake system after installation is essential to remove air and restore full hydraulic function. Use the correct thread pitch (M12 x 1.0) fittings to avoid leaks and ensure secure connections. It is recommended to inspect all brake lines and related components during installation for wear or damage.

Quality Assurance and Warranty

Dorman manufactures the M630751 brake master cylinder to meet or exceed OEM specifications for fit and function on compatible Audi models. The aluminum construction provides durability and corrosion resistance. While specific warranty details are not provided here, Dorman typically offers limited warranties on their brake hydraulic components to cover defects in materials and workmanship.