Dorman M390277 Brake Master Cylinder

Reliable Brake Master Cylinder for Chevrolet Cavalier and Pontiac Sunfire

The Dorman M390277 brake master cylinder is designed specifically for Chevrolet Cavalier and Pontiac Sunfire models. This aluminum master cylinder includes a reservoir and sensor, providing a complete solution for your brake hydraulics system.

• Master cylinder bore diameter: 0.875 inches
• Constructed from durable aluminum material
• Includes reservoir for fluid storage
• Equipped with a sensor for brake system monitoring
• Two outlet ports with rearward outlet size M10 x 1.0 and thread pitch 1.0
• Secondary outlet thread diameter: 10 mm
• Mounting hardware not included

Product Details and Specifications

The Dorman M390277 brake master cylinder features a precise 0.875-inch bore diameter, ensuring proper hydraulic pressure for effective braking performance. Made from aluminum, this master cylinder offers corrosion resistance and long-lasting durability. It comes with an integrated reservoir to hold brake fluid and a sensor to monitor brake system status, which is essential for maintaining safety and performance. The unit has two outlets, including a rearward outlet sized M10 x 1.0 with a thread pitch of 1.0, and a secondary outlet thread diameter of 10 mm, compatible with the brake lines on Chevrolet Cavalier and Pontiac Sunfire vehicles.

Compatible Vehicles and Applications

This brake master cylinder is compatible with the following vehicles:

• Chevrolet Cavalier
• Pontiac Sunfire

It is designed to replace the original equipment part and restore proper brake hydraulic function in these models.

Common Issues Addressed by This Master Cylinder

• Brake pedal sinking or sponginess due to internal leaks
• Brake fluid leaks from a worn or damaged master cylinder
• Brake warning light activation caused by sensor failure
• Reduced braking efficiency from improper hydraulic pressure
• Contaminated or deteriorated brake fluid reservoir

Installation Notes and Tips

• Ensure brake system is properly bled after installation to remove air
• Verify compatibility with Chevrolet Cavalier or Pontiac Sunfire before purchase
• Use appropriate brake fluid as specified by the vehicle manufacturer
• Mounting hardware is not included; retain original hardware or source separately
• Handle the sensor connection carefully to avoid damage

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The M390277 brake master cylinder undergoes rigorous quality control to ensure reliable performance. Warranty coverage details can be obtained from the product documentation or manufacturer.