Dorman M390483 Brake Master Cylinder

Reliable Brake Master Cylinder for Infiniti Q45

The Dorman M390483 brake master cylinder is engineered to restore proper brake hydraulics for your Infiniti Q45. Designed with precision, this aluminum master cylinder includes a reservoir and sensor to ensure consistent brake performance.

• Master cylinder bore diameter: 1 inch for accurate hydraulic pressure
• Constructed from durable aluminum material
• Includes reservoir for fluid storage
• Equipped with a sensor for brake system monitoring
• Two outlets with rearward outlet size M10 x 1.0 and thread pitch 1.0
• Secondary outlet thread diameter of 10 mm
• Package contains the master cylinder only; mounting hardware not included

Product Details and Specifications

This Dorman brake master cylinder (part number M390483) is specifically designed for the Infiniti Q45, ensuring compatibility and reliable fitment. The 1-inch bore diameter provides the necessary hydraulic pressure for effective braking. Made from aluminum, the master cylinder offers corrosion resistance and long-lasting durability. The included reservoir allows for proper brake fluid containment, while the integrated sensor supports brake system diagnostics and safety features. The unit features two outlets, including a rearward outlet sized M10 x 1.0 with a 1.0 thread pitch, and a secondary outlet with a 10 mm thread diameter, facilitating straightforward connection to the brake lines.

Common Applications and Problem Resolution

• Restores brake pressure loss due to worn or damaged master cylinder
• Eliminates brake fluid leaks from the master cylinder reservoir or seals
• Resolves brake pedal sinking or sponginess caused by internal cylinder wear
• Supports brake system sensor functionality for warning light accuracy
• Replaces faulty or corroded master cylinders in Infiniti Q45 brake hydraulics

Installation Notes and Tips

Installation of the Dorman M390483 brake master cylinder requires proper brake system bleeding to remove air and ensure optimal performance. Note that mounting hardware is not included, so retain original fasteners or acquire compatible replacements. Verify thread sizes (M10 x 1.0) for brake line fittings to ensure correct connection. Sensor wiring should be carefully reconnected to maintain brake system monitoring functions.

Quality Assurance and Warranty

Dorman manufactures this brake master cylinder to meet or exceed OEM specifications for the Infiniti Q45. The aluminum construction and integrated sensor contribute to reliable operation under normal driving conditions. While mounting hardware is not included, the product is backed by Dorman's standard warranty coverage, providing confidence in its durability and fitment.