Dorman M630868 Brake Master Cylinder

Reliable Brake Master Cylinder for Chevrolet Cobalt

The Dorman M630868 brake master cylinder is designed specifically for Chevrolet Cobalt models, providing precise hydraulic control for your vehicle's braking system. This master cylinder features a durable aluminum construction and includes a single reservoir with an integrated sensor to ensure optimal performance.

• Compatible with Chevrolet Cobalt vehicles
• Master cylinder bore diameter: 0.938 inches
• Constructed from lightweight, corrosion-resistant aluminum
• Includes a single reservoir with sensor for fluid level monitoring
• Two outlet ports with M12 x 1.0 thread size for secure brake line connections
• Mounting hardware not included

Product Details and Specifications

The Dorman M630868 brake master cylinder is engineered with a 0.938-inch bore diameter to match the hydraulic requirements of the Chevrolet Cobalt. Its aluminum body offers strength and resistance to corrosion, contributing to long-term reliability. The unit comes with a single reservoir that holds brake fluid and includes a sensor to monitor fluid levels, helping maintain safe braking conditions. The master cylinder features two outlets, both with M12 x 1.0 thread pitch, ensuring compatibility with the vehicle's brake lines. Note that mounting hardware is not included with this part.

Common Applications and Problem Resolution

• Restores proper brake fluid pressure for consistent braking response
• Replaces worn or leaking master cylinders causing brake fluid loss
• Addresses brake pedal sinking or sponginess due to internal seal failure
• Resolves brake warning light activation related to fluid level sensor issues
• Improves overall brake system reliability on Chevrolet Cobalt models

Installation Notes and Tips

Installation of the Dorman M630868 brake master cylinder requires basic mechanical skills and proper brake system knowledge. Ensure the brake fluid reservoir is filled with the correct fluid type and bleed the brake system thoroughly after installation to remove air. Since mounting hardware is not included, retain or source the necessary bolts and fittings compatible with your Chevrolet Cobalt. Verify all connections, especially the sensor wiring and outlet threads, are secure to prevent leaks or sensor malfunctions.

Quality Assurance and Warranty Information

Dorman manufactures this brake master cylinder to meet or exceed OEM specifications for fit, form, and function on Chevrolet Cobalt vehicles. The aluminum construction provides durability and corrosion resistance. This part includes a fluid level sensor to maintain system safety. While mounting hardware is not supplied, the product undergoes quality checks to ensure reliable operation. Warranty coverage details should be confirmed with the point of purchase or manufacturer documentation.