Dorman M630033 Brake Master Cylinder

Reliable Brake Master Cylinder for Chevrolet Cavalier and Pontiac Sunfire

The Dorman M630033 Brake Master Cylinder is designed to restore proper brake hydraulics for Chevrolet Cavalier and Pontiac Sunfire models. Engineered with precision, this master cylinder ensures consistent brake fluid pressure and reliable stopping power.

• Master cylinder bore diameter: 0.875 inches for accurate fluid displacement
• Constructed from durable aluminum material for corrosion resistance
• Includes reservoir and sensor for complete brake system integration
• Two outlets with rearward outlet size M11 x 1.5 and secondary outlet thread diameter M12 x 1.0
• Thread pitch of 1.0 for secure fitting
• Package contains the master cylinder only; mounting hardware not included

Product Details and Specifications

The Dorman M630033 brake master cylinder features a robust aluminum construction that resists corrosion and wear, extending the service life of your brake system. The 0.875-inch bore diameter is calibrated to provide precise hydraulic pressure, essential for the braking performance of Chevrolet Cavalier and Pontiac Sunfire vehicles. This master cylinder comes with an integrated reservoir and sensor, facilitating seamless communication with the vehicle’s brake system for optimal safety and functionality. The dual outlet design includes a rearward outlet sized M11 x 1.5 and a secondary outlet with M12 x 1.0 thread diameter, both with a 1.0 thread pitch, ensuring compatibility with the original brake lines.

Common Applications and Problem Resolution

• Restores brake fluid pressure in Chevrolet Cavalier and Pontiac Sunfire brake systems
• Replaces worn or leaking master cylinders causing brake pedal sponginess
• Addresses brake fluid leaks from damaged or corroded master cylinders
• Resolves brake warning light issues related to sensor failure
• Improves overall brake responsiveness and safety

Installation Notes and Tips

Installation of the Dorman M630033 master cylinder requires careful attention to brake line connections and proper bleeding of the brake system to remove air. Since mounting hardware is not included, retain original fasteners or acquire compatible hardware before installation. Verify thread sizes (M11 x 1.5 rearward outlet and M12 x 1.0 secondary outlet) to ensure proper fitment with existing brake lines. It is recommended to inspect brake lines and related components during installation for any signs of wear or damage.

Quality Assurance and Warranty Information

Dorman manufactures the M630033 brake master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction and integrated sensor contribute to reliable performance and durability. This part is backed by Dorman’s limited warranty, providing coverage against defects in material and workmanship under normal use conditions.