Dorman M639011 Brake Master Cylinder

Reliable Brake Master Cylinder for Chevrolet Chevy Pickup

The Dorman M639011 brake master cylinder is engineered to provide consistent hydraulic pressure for your Chevrolet Chevy and Chevy Pickup models. Designed with durable cast iron and precise bore dimensions, this master cylinder ensures dependable braking performance.

Key Features of the Dorman M639011 Brake Master Cylinder

• Master cylinder bore diameter: 0.813 inches for accurate hydraulic control
• Constructed from cast iron for strength and durability
• Includes four outlets to support complex brake line configurations
• Rearward outlet size: M10 x 1.0 thread for secure fitting
• Secondary outlet thread diameter: M12 x 1.0 with 1.0 thread pitch
• Package contains the master cylinder only; reservoir and mounting hardware not included

Detailed Description of the Dorman M639011 Brake Master Cylinder

This brake master cylinder is specifically designed for Chevrolet Chevy and Chevy Pickup vehicles, providing a precise fit and reliable operation. The 0.813-inch bore diameter allows for optimal hydraulic pressure generation, essential for effective brake system performance. Manufactured from cast iron, the unit offers resistance to wear and corrosion, extending the service life of your braking system. The four outlet ports accommodate multiple brake lines, with rearward and secondary outlet threads sized at M10 x 1.0 and M12 x 1.0 respectively, ensuring compatibility with factory brake line fittings.

Common Applications and Issues Addressed

• Restores proper hydraulic pressure in brake systems for Chevrolet Chevy and Chevy Pickup
• Replaces worn or leaking master cylinders causing brake pedal sponginess
• Solves brake fluid leakage due to damaged or corroded master cylinder bodies
• Addresses inconsistent braking response from internal seal failure
• Supports brake system rebuilds requiring a cast iron master cylinder with specific outlet threading

Installation Notes and Tips

• Ensure compatibility with your Chevrolet Chevy or Chevy Pickup model before installation
• Brake fluid reservoir and mounting hardware are not included and must be sourced separately
• Bleed the brake system thoroughly after installation to remove air and ensure proper hydraulic function
• Inspect brake lines and fittings for wear or damage during installation
• Follow manufacturer torque specifications for outlet fittings to prevent leaks

Quality Assurance and Warranty Information

Dorman manufactures the M639011 brake master cylinder to meet or exceed OEM standards for fit and function. The cast iron construction provides durability under demanding conditions. While mounting hardware and reservoir are not included, the master cylinder is designed for straightforward integration into Chevrolet Chevy and Chevy Pickup brake systems. Please refer to Dorman's warranty policy for coverage details.