Dorman M390301 Brake Master Cylinder

Reliable Brake Master Cylinder for Saturn SC and SL Models

The Dorman M390301 brake master cylinder is engineered to restore proper brake hydraulics for Saturn SC, SC1, SC2, SL, SL1, SL2, SW1, and SW2 vehicles. Designed with precision, this aluminum master cylinder includes a reservoir and sensor to ensure consistent brake performance.

Key Features of the Dorman M390301 Brake Master Cylinder

• Master cylinder bore diameter of 0.875 inches for accurate hydraulic pressure
• Durable aluminum construction for corrosion resistance and longevity
• Includes reservoir for fluid storage and sensor for brake system monitoring
• Four outlet ports with a secondary outlet thread diameter of 10 mm
• Rearward outlet size compatible with M10 x 1.0 thread and unthreaded fittings
• Package contains the master cylinder unit without mounting hardware

Detailed Product Description

The Dorman M390301 brake master cylinder is specifically designed for Saturn SC and SL series vehicles, including SC1, SC2, SL1, SL2, SW1, and SW2 models. Constructed from aluminum, this master cylinder offers enhanced durability and resistance to corrosion compared to traditional materials. The 0.875-inch bore diameter ensures precise hydraulic pressure delivery, which is critical for effective brake system operation. This unit comes complete with an integrated reservoir and sensor, allowing for seamless fluid management and brake system monitoring. The four outlet ports, including a secondary outlet with a 10 mm thread diameter and a rearward outlet sized M10 x 1.0 and unthreaded, provide compatibility with the vehicle’s brake lines. Note that mounting hardware is not included and should be sourced separately.

Common Applications and Issues Addressed

• Restores brake pressure loss due to worn or damaged master cylinder
• Eliminates brake fluid leaks from the master cylinder reservoir or outlets
• Resolves brake pedal sinking or sponginess caused by internal cylinder wear
• Replaces faulty brake fluid level sensor to maintain system alerts
• Improves overall brake system responsiveness and safety on Saturn SC and SL models

Installation Notes and Tips

• Ensure compatibility with Saturn SC, SC1, SC2, SL, SL1, SL2, SW1, and SW2 before installation
• Bleed the brake system thoroughly after installation to remove air pockets
• Use appropriate brake fluid as specified by the vehicle manufacturer
• Mounting hardware is not included; verify existing hardware condition or acquire new parts as needed
• Check sensor connections for proper operation after installation

Quality Assurance and Warranty

Dorman manufactures the M390301 brake master cylinder to meet or exceed OEM specifications for fit, form, and function. The aluminum construction and integrated sensor contribute to reliable brake system performance. While specific warranty details are not provided, Dorman products typically come with a limited warranty covering defects in materials and workmanship. Consult product documentation or contact the manufacturer for exact warranty terms.