Dorman M390158 Brake Master Cylinder

Reliable Brake Master Cylinder Replacement for Your Vehicle

The Dorman M390158 Brake Master Cylinder is engineered to restore proper brake hydraulics performance in compatible vehicles. Designed with precision, this master cylinder includes a reservoir and sensor to ensure accurate brake fluid management and system monitoring.

• Master cylinder bore diameter of 1.313 inches for consistent hydraulic pressure
• Durable aluminum construction for corrosion resistance and longevity
• Includes reservoir and sensor for integrated brake fluid level monitoring
• Three outlets with specific thread sizes: rearward outlet 9/16-18 & 3/8-24, secondary outlet 7/16-24
• Package contains the master cylinder assembly ready for installation

Detailed Product Description

The Dorman M390158 brake master cylinder is crafted from aluminum, providing a lightweight yet robust component that resists corrosion and wear. Its 1.313-inch bore diameter is designed to deliver precise hydraulic pressure to the brake system, ensuring responsive braking performance. This master cylinder comes equipped with a reservoir to hold brake fluid and a sensor to monitor fluid levels, which helps maintain system safety and alerts drivers to potential issues. Featuring three outlets with specific thread sizes, it supports proper brake line connections for reliable fluid distribution.

Compatible Vehicle Applications and Common Uses

This brake master cylinder is suitable for various vehicle makes and models requiring a 1.313-inch bore diameter and the specified outlet thread sizes. It is commonly used to address issues such as:

• Brake pedal sinking or sponginess due to master cylinder wear
• Brake fluid leaks around the master cylinder area
• Inconsistent brake pressure affecting stopping performance
• Warning lights triggered by faulty brake fluid level sensors
• Replacement during brake system overhauls or upgrades

Installation Notes and Tips

When installing the Dorman M390158 master cylinder, ensure the brake system is properly bled to remove air and maintain hydraulic integrity. Verify compatibility with your vehicle’s brake line fittings, especially the rearward and secondary outlet thread sizes. Although mounting hardware is not included, use the existing hardware or source appropriate fasteners to secure the unit. Follow manufacturer torque specifications to avoid damage.

Quality Assurance and Warranty Information

Dorman manufactures this brake master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction and integrated sensor contribute to reliable operation over time. Please refer to Dorman’s warranty policy for specific coverage details on the M390158 part number.