Dorman M390331 Brake Master Cylinder

Reliable Brake Master Cylinder for Honda Civic

The Dorman M390331 brake master cylinder is engineered to restore proper brake hydraulics in your Honda Civic. Designed with precision, this aluminum master cylinder includes a reservoir and sensor to ensure consistent brake fluid management and system monitoring.

• Master cylinder bore diameter: 0.875 inches for accurate hydraulic pressure
• Constructed from durable aluminum material for corrosion resistance
• Includes reservoir for brake fluid storage
• Equipped with sensor for brake system monitoring
• Two outlets with rearward outlet size M10 x 1.0 and thread pitch 1.0

Product Details and Specifications

The Dorman M390331 brake master cylinder is specifically designed for Honda Civic models, providing a precise fit and reliable performance. Its aluminum construction offers durability and resistance to corrosion, which is critical for maintaining brake system integrity. The 0.875-inch bore diameter ensures proper hydraulic pressure is generated for effective braking. This master cylinder comes with an integrated reservoir to hold brake fluid and a sensor to monitor fluid levels or system status. Featuring two outlets, including a rearward outlet with M10 x 1.0 thread diameter and 1.0 thread pitch, it supports proper brake line connections without the need for additional adapters.

Common Applications and Problem Resolution

• Restores brake pressure in Honda Civic brake hydraulics
• Replaces leaking or damaged master cylinders causing brake fluid loss
• Resolves brake pedal sponginess due to internal cylinder wear
• Addresses sensor faults related to brake fluid monitoring
• Fixes improper brake fluid reservoir issues affecting system performance

Installation Notes and Tips

Installation of the Dorman M390331 brake master cylinder requires careful attention to brake fluid handling and bleeding procedures. Ensure the brake system is properly bled after installation to remove air and maintain braking efficiency. Note that mounting hardware is not included, so retain original fasteners or acquire appropriate replacements. Verify thread sizes and outlet connections match your vehicle’s brake lines before installation.

Quality Assurance and Warranty

Dorman manufactures this brake master cylinder to meet or exceed OEM specifications for Honda Civic brake hydraulics. The aluminum construction and integrated sensor contribute to long-term reliability. While specific warranty details are not provided here, Dorman products typically come with a limited warranty covering defects in materials and workmanship.