Dorman M390323 Brake Master Cylinder

Overview of the Dorman Brake Master Cylinder for Honda Civic

The Dorman M390323 brake master cylinder is designed specifically for Honda Civic models, providing reliable brake hydraulics performance. This aluminum master cylinder includes a reservoir and sensor, ensuring compatibility and functionality for your vehicle's braking system.

• Compatible with Honda Civic models
• Master cylinder bore diameter: 0.875 inches
• Constructed from durable aluminum material
• Includes reservoir and sensor for integrated operation
• 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

Detailed Product Description

The Dorman M390323 brake master cylinder is engineered to meet the specific hydraulic requirements of Honda Civic vehicles. Featuring a 0.875-inch bore diameter, this aluminum master cylinder offers corrosion resistance and strength for consistent brake fluid pressure. The included reservoir allows for proper fluid storage and monitoring, while the integrated sensor supports brake system diagnostics. With two outlets, including a rearward outlet sized M10 x 1.0 and a secondary outlet thread diameter of 10 mm, this master cylinder ensures proper fluid distribution within the brake system. The thread pitch of 1.0 facilitates secure connections to brake lines. Note that mounting hardware is not included, so existing hardware or separate purchase may be necessary.

Common Applications and Issues Addressed

• Restores proper brake fluid pressure in Honda Civic brake systems
• Replaces worn or leaking master cylinders causing brake pedal sponginess
• Resolves brake fluid leaks from damaged or corroded master cylinders
• Supports brake system sensor functionality for warning light accuracy
• Addresses inconsistent braking performance due to master cylinder failure

Installation Notes and Tips

• Compatible with Honda Civic brake systems; verify model year for exact fit
• Ensure brake fluid reservoir is properly filled and free of contaminants before installation
• Bleed brake system thoroughly after installation to remove air pockets
• Use appropriate tools for M10 x 1.0 threaded connections to avoid damage
• Mounting hardware is not included; retain original hardware or acquire suitable replacements

Quality Assurance and Warranty

Dorman manufactures the M390323 brake master cylinder to meet or exceed OEM specifications for Honda Civic vehicles. The aluminum construction provides durability and resistance to corrosion. This part includes a sensor and reservoir to maintain system integrity. While mounting hardware is not included, the product undergoes quality checks to ensure proper fit and function. Warranty coverage details should be confirmed with the point of purchase or manufacturer documentation.