Dorman M630407 Brake Master Cylinder

Reliable Brake Master Cylinder for Chevrolet and Pontiac Vehicles

The Dorman M630407 brake master cylinder is engineered to restore proper brake hydraulics in select Chevrolet and Pontiac models. Designed with precision, this master cylinder ensures consistent brake fluid pressure for safe and effective braking performance.

Key Features of the Dorman M630407 Brake Master Cylinder

• Master cylinder bore diameter of 0.875 inches for accurate fluid displacement
• Constructed from durable aluminum material for corrosion resistance and longevity
• Includes an integrated reservoir for brake fluid storage
• Equipped with a sensor to monitor brake fluid levels
• Two outlet ports with rearward outlet size M10 x 1.0 and secondary outlet thread diameter M12 x 1.0
• Thread pitch of 1.0 for secure fitting
• Package contains the master cylinder unit only; mounting hardware not included

Detailed Product Description

The Dorman M630407 brake master cylinder is specifically designed for compatibility with Chevrolet Cobalt, Pontiac G5, and Pontiac Pursuit models. Its aluminum construction provides a lightweight yet robust solution resistant to rust and wear. The 0.875-inch bore diameter allows for precise hydraulic pressure control, essential for maintaining consistent brake pedal feel and stopping power. The included reservoir and sensor help maintain optimal brake fluid levels, contributing to overall brake system reliability. With two outlets featuring M10 x 1.0 and M12 x 1.0 thread sizes, this master cylinder integrates seamlessly with the vehicle’s brake lines.

Common Applications and Problem Resolution

• Restores brake fluid pressure in vehicles experiencing soft or spongy brake pedal feel
• Replaces master cylinders with leaking or damaged reservoirs
• Addresses brake fluid level sensor malfunctions to ensure proper warning signals
• Solves issues related to inconsistent braking performance due to worn master cylinder components
• Suitable for maintenance or repair of brake hydraulics in Chevrolet Cobalt, Pontiac G5, and Pursuit models

Installation Notes and Tips

• Ensure brake system is properly bled after installation to remove air from hydraulic lines
• Verify thread sizes (M10 x 1.0 and M12 x 1.0) match vehicle brake line fittings before installation
• Use appropriate brake fluid as specified by the vehicle manufacturer
• Check sensor connections for secure fit to maintain accurate brake fluid level monitoring

Quality Assurance and Warranty Information

Dorman manufactures the M630407 brake master cylinder to meet or exceed OEM specifications for fit, form, and function. The aluminum construction and integrated sensor contribute to long-term durability and reliable brake system performance. While specific warranty details are not provided here, Dorman products typically come with a limited warranty covering defects in materials and workmanship.