Dorman M639008 Brake Master Cylinder

Overview of Dorman Brake Master Cylinder for Chevrolet Astra

The Dorman M639008 brake master cylinder is designed specifically for Chevrolet Astra models, providing reliable brake hydraulics performance. Crafted from durable aluminum, this master cylinder ensures consistent braking pressure and long-lasting operation.

• Compatible with Chevrolet Astra vehicles
• Master cylinder bore diameter: 0.938 inches
• Constructed from aluminum for strength and corrosion resistance
• Includes two outlets with rearward outlet size M10 x 1.0 and secondary outlet thread diameter M12 x 1.0
• Does not include mounting hardware, reservoir, or sensor
• Package contains the master cylinder only

Detailed Product Description

The Dorman M639008 brake master cylinder is engineered to meet the specific hydraulic requirements of the Chevrolet Astra. Its 0.938-inch bore diameter is optimized for precise brake fluid displacement, ensuring effective pressure delivery to the brake system. Made from aluminum, the master cylinder offers a balance of lightweight design and resistance to corrosion, which is critical for maintaining brake system integrity over time.

This master cylinder features two outlets: a rearward outlet sized M10 x 1.0 and a secondary outlet with a thread diameter of M12 x 1.0, both with a thread pitch of 1.0. These specifications align with the original equipment requirements for the Chevrolet Astra, facilitating straightforward integration into the vehicle's brake hydraulics system. Note that this product does not include the reservoir, sensor, or mounting hardware, so those components must be sourced separately if needed.

Common Applications and Problem Resolution

• Restores proper brake fluid pressure in Chevrolet Astra brake systems
• Replaces worn or leaking master cylinders causing brake pedal issues
• Addresses brake fluid leaks from the master cylinder body or outlets
• Solves inconsistent brake pedal feel or sponginess due to internal wear
• Supports brake system maintenance and safety compliance

Installation Notes and Tips

• Ensure compatibility with Chevrolet Astra before installation
• Bleed the brake system thoroughly after installation to remove air
• Use appropriate brake fluid as specified by the vehicle manufacturer
• Inspect related brake components such as the reservoir and sensors, as these are not included
• Verify outlet thread sizes (M10 x 1.0 and M12 x 1.0) for proper hose fitting

Quality Assurance and Warranty

Dorman manufactures the M639008 brake master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction provides durability and corrosion resistance essential for brake system components. While specific warranty details should be confirmed at the point of purchase, Dorman typically offers limited warranties covering defects in material and workmanship to ensure product reliability.