Dorman M390004 Brake Master Cylinder

Reliable Brake Master Cylinder for Nissan NX and Sentra

The Dorman M390004 brake master cylinder is engineered to restore proper brake hydraulics in Nissan NX and Sentra models. Designed with precision, this aluminum master cylinder includes a reservoir and sensor to ensure consistent brake performance.

Key Features of the Dorman M390004 Brake Master Cylinder

• Master cylinder bore diameter: 0.813 inches for accurate hydraulic pressure
• Constructed from durable aluminum material for corrosion resistance
• Includes reservoir for fluid storage and sensor for brake system monitoring
• Four outlets with a secondary outlet thread diameter of 10 mm
• Rearward outlet size: M10 x 1.0 with a thread pitch of 1.0
• Package contains the master cylinder unit; mounting hardware not included

Detailed Description and Specifications

This Dorman brake master cylinder (part number M390004) is specifically designed for Nissan NX and Sentra vehicles, providing a precise fit and reliable brake hydraulics. The aluminum construction offers strength and resistance to corrosion, extending the service life of the component. The included reservoir allows for proper brake fluid containment, while the integrated sensor supports brake system diagnostics and safety features. With four outlets and a secondary outlet thread diameter of 10 mm, this master cylinder supports efficient brake fluid distribution. The rearward outlet size of M10 x 1.0 and thread pitch of 1.0 ensure compatibility with OEM brake lines.

Common Brake Issues Addressed by This Master Cylinder

• Spongy or unresponsive brake pedal feel
• Brake fluid leaks from the master cylinder or reservoir
• Brake warning light activation due to sensor faults
• Uneven brake pressure causing poor stopping performance
• Brake pedal sinking or failure to maintain pressure

Installation Notes and Tips

• Ensure brake system is properly bled after installation to remove air
• Verify compatibility with Nissan NX and Sentra models before installation
• Use appropriate tools for M10 x 1.0 thread fittings to avoid damage
• Check sensor connections for secure fit and proper function
• Mounting hardware is not included; reuse existing hardware or acquire separately

Quality Assurance and Warranty Information

Dorman manufactures this brake master cylinder to meet or exceed OEM specifications for Nissan NX and Sentra vehicles. The part number M390004 undergoes rigorous quality control to ensure durability and performance. While mounting hardware is not included, the product is backed by Dorman's standard warranty coverage, providing confidence in its reliability and fitment.