Dorman M390404 Brake Master Cylinder

Reliable Brake Master Cylinder for Acura and Honda Vehicles

The Dorman M390404 brake master cylinder is designed to restore proper brake hydraulics in select Acura and Honda models. Engineered with durable aluminum construction, this master cylinder ensures consistent performance for your Prelude, RL, or TL.

Key Features of the Dorman M390404 Brake Master Cylinder

• Master cylinder bore diameter: 1 inch for precise hydraulic pressure
• Constructed from aluminum for strength and corrosion resistance
• Includes two outlets with a rearward outlet size of M10 x 1.0 and thread pitch of 1.0
• Does not include mounting hardware or reservoir, allowing compatibility with existing components
• Package contains the master cylinder only, no sensor included

Detailed Product Description

The Dorman M390404 brake master cylinder is a direct replacement part designed specifically for Acura Prelude, Honda RL, and Honda TL models. Its 1-inch bore diameter provides the necessary hydraulic pressure to maintain effective braking performance. Made from aluminum, this master cylinder offers durability and resistance to corrosion, which is critical for brake system components exposed to varying conditions. The unit features two outlets, including a rearward outlet sized M10 x 1.0 with a 1.0 thread pitch, ensuring compatibility with the brake lines on these vehicles. This part does not include a reservoir or mounting hardware, making it suitable for installations where the original reservoir and hardware remain in good condition.

Common Applications and Issues Addressed

• Restores brake hydraulic pressure in Acura Prelude, Honda RL, and TL models
• Replaces worn or leaking master cylinders causing brake fluid loss
• Fixes spongy or unresponsive brake pedal feel due to internal cylinder wear
• Addresses brake system failure symptoms related to master cylinder malfunction
• Supports maintenance of brake system integrity without replacing reservoir or sensors

Installation Notes and Tips

• Ensure compatibility with your specific Acura or Honda model year before installation
• Bleed the brake system thoroughly after installation to remove air and ensure proper hydraulic function
• Retain original mounting hardware and reservoir if in good condition, as these are not included
• Check thread pitch and outlet sizes to confirm fit with existing brake lines

Quality Assurance and Warranty Information

Dorman manufactures the M390404 brake master cylinder to meet or exceed OEM specifications for fit and function. The aluminum construction provides long-lasting durability under normal operating conditions. While mounting hardware and reservoir are not included, the master cylinder itself is tested for reliable performance. Please refer to Dorman's warranty policy for coverage details on this part.