Dorman M630935 Brake Master Cylinder

Reliable Brake Master Cylinder for Audi A8 Quattro and S8

The Dorman M630935 brake master cylinder is engineered to restore proper brake hydraulics in select Audi models. Designed specifically for Audi A8 Quattro, Allroad Quattro, and S8 vehicles, this cast iron master cylinder ensures consistent brake fluid pressure and reliable stopping power.

Key Features of the Dorman M630935 Brake Master Cylinder

• Constructed from durable cast iron for long-lasting performance
• Master cylinder bore diameter of 1 inch for precise hydraulic control
• Includes two outlets with rearward outlet size M10 x 1.0 and secondary outlet thread diameter M12 x 1.0
• Removable reservoir type (reservoir not included)
• Package contains the master cylinder only; mounting hardware and sensor are not included

Detailed Product Description

The Dorman M630935 brake master cylinder is a critical component in the brake hydraulics system of Audi A8 Quattro, Allroad Quattro, and S8 models. Manufactured from cast iron, it offers strength and resistance to wear under high pressure. The 1-inch bore diameter is designed to provide accurate brake fluid displacement, ensuring consistent brake pedal feel and effective braking response. This master cylinder features two outlets, with precise thread sizes (M10 x 1.0 rearward outlet and M12 x 1.0 secondary outlet) to match factory brake line fittings. The removable reservoir design allows for easy maintenance, although the reservoir itself is not included with this part. Note that mounting hardware and sensors are not part of this package, so these components must be sourced separately if needed.

Common Applications and Issues Addressed

• Restores brake fluid pressure in Audi A8 Quattro, Allroad Quattro, and S8 brake systems
• Replaces master cylinders with internal leaks or worn seals causing brake pedal sinking
• Solves inconsistent brake pedal feel or sponginess due to master cylinder wear
• Addresses brake fluid contamination or corrosion inside the master cylinder bore
• Fixes brake warning light issues related to master cylinder failure (sensor not included)

Installation Notes and Tips

• Ensure compatibility with Audi A8 Quattro, Allroad Quattro, and S8 models before installation
• Bleed the brake system thoroughly after installation to remove air and ensure proper hydraulic function
• Mounting hardware is not included; reuse existing hardware or acquire appropriate fasteners
• Inspect brake lines and fittings for damage or wear during installation
• Use recommended brake fluid type as specified by the vehicle manufacturer

Quality Assurance and Warranty Information

Dorman manufactures the M630935 brake master cylinder to meet or exceed OEM specifications for fit, form, and function. The cast iron construction provides durability under demanding braking conditions. While specific warranty details are not provided here, Dorman typically offers limited warranties covering defects in materials and workmanship. Consult product documentation or the supplier for exact warranty terms.