Dorman M630638 Brake Master Cylinder

Reliable Brake Master Cylinder for Chevrolet Aveo and Pontiac G3

The Dorman M630638 brake master cylinder is engineered to restore proper brake hydraulics in select Chevrolet and Pontiac models. Designed with precision, this aluminum master cylinder includes a reservoir and sensor to ensure consistent brake performance for your Aveo, Aveo5, G3, or G3 Wave.

Key Features of the Dorman M630638 Brake Master Cylinder

• Master cylinder bore diameter: 0.875 inches for accurate hydraulic pressure
• Constructed from durable aluminum material for corrosion resistance
• Includes reservoir for fluid storage and sensor for brake system monitoring
• Two outlets with rearward outlet size M10 x 1.0 and thread pitch 1.0
• Secondary outlet thread diameter of 10 mm
• Package contains the master cylinder only; mounting hardware not included

Detailed Product Description

The Dorman M630638 brake master cylinder is designed specifically for Chevrolet Aveo, Aveo5, Pontiac G3, and G3 Wave models, providing a direct replacement for the original component. Its aluminum construction offers enhanced durability and resistance to wear and corrosion, which is critical for maintaining brake system integrity. The included reservoir allows for proper brake fluid containment, while the integrated sensor supports vehicle brake system diagnostics. With a bore diameter of 0.875 inches and dual outlets, this master cylinder ensures reliable hydraulic pressure distribution to the brake calipers or wheel cylinders.

Common Brake Issues Addressed by This Master Cylinder

• Spongy or unresponsive brake pedal feel
• Brake fluid leaks from the master cylinder or reservoir
• Brake warning light activation due to sensor failure
• Reduced braking efficiency or uneven brake pressure
• Contaminated or degraded brake fluid affecting system performance

Installation Notes and Tips

• Ensure compatibility with Chevrolet Aveo, Aveo5, Pontiac G3, and G3 Wave before installation
• Bleed the brake system thoroughly after installation to remove air pockets
• Use appropriate brake fluid as specified by the vehicle manufacturer
• Check sensor connections for proper fit and function
• Mounting hardware is not included; reuse existing hardware or source separately

Quality Assurance and Warranty

Dorman manufactures the M630638 brake master cylinder to meet or exceed OEM specifications for fit, form, and function. The aluminum construction and integrated sensor contribute to long-term reliability. While mounting hardware is not included, the product undergoes rigorous quality control to ensure consistent performance. Warranty coverage details should be confirmed with the point of purchase or manufacturer documentation.