Dorman M390406 Brake Master Cylinder

Reliable Brake Master Cylinder for Honda Civic

The Dorman M390406 Brake Master Cylinder is engineered to restore proper brake hydraulics for Honda Civic models. Designed with precision, this master cylinder ensures consistent brake fluid pressure and reliable stopping power.

• Master cylinder bore diameter of 0.938 inches for accurate fluid displacement
• Durable aluminum construction for corrosion resistance and longevity
• Includes reservoir for brake fluid storage
• Equipped with a sensor to monitor brake system status
• Two outlets with rearward outlet size M10 x 1.0 and thread pitch 1.0 for secure connections

Product Details and Specifications

This Dorman brake master cylinder features a 0.938-inch bore diameter, which is critical for maintaining the correct hydraulic pressure in the brake system of your Honda Civic. The aluminum material offers a lightweight yet robust design that resists corrosion over time. The included reservoir allows for proper brake fluid containment, while the integrated sensor provides feedback to the vehicle’s brake monitoring system. With two outlets and a secondary outlet thread diameter of 10 mm, this master cylinder supports efficient fluid distribution to the brake lines. The rearward outlet size of M10 x 1.0 and thread pitch of 1.0 ensure compatibility with OEM brake fittings.

Compatible Vehicles and Applications

• Compatible with Honda Civic models requiring a 0.938-inch bore master cylinder
• Ideal replacement for brake master cylinder failures or leaks
• Restores brake pedal feel and hydraulic pressure consistency
• Addresses issues such as brake fluid leaks, spongy brake pedal, and brake warning light activation

Installation Notes and Tips

Installation of the Dorman M390406 brake master cylinder requires proper brake system bleeding to remove air and ensure optimal performance. Verify thread sizes and outlet fittings match your vehicle’s brake lines before installation. Since mounting hardware is not included, retain original hardware or source compatible fasteners. Consult the vehicle’s service manual for torque specifications and sensor connection procedures.

Quality Assurance and Warranty

Dorman manufactures this brake master cylinder to meet or exceed OEM standards for fit and function. The aluminum construction and integrated sensor contribute to reliable brake system operation. While specific warranty details are not provided, Dorman products typically come with a limited warranty covering defects in materials and workmanship.