Dorman M390367 Brake Master Cylinder

Reliable Brake Master Cylinder for Toyota 4Runner

The Dorman M390367 brake master cylinder is designed specifically for Toyota 4Runner models, providing precise hydraulic control for your vehicle's braking system. Engineered with durable aluminum and equipped with essential features, this master cylinder ensures consistent brake performance.

• Master cylinder bore diameter: 1 inch for accurate hydraulic pressure
• Constructed from lightweight, corrosion-resistant aluminum
• Includes reservoir for brake fluid management
• Equipped with a sensor for monitoring brake system status
• 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

The Dorman M390367 brake master cylinder features a 1-inch bore diameter, which is critical for maintaining proper hydraulic pressure within the brake system of Toyota 4Runner vehicles. Its aluminum construction offers a balance of strength and corrosion resistance, contributing to long-term durability. The included reservoir allows for efficient brake fluid storage and management, while the integrated sensor provides real-time monitoring of brake system conditions. This master cylinder has two outlets, including a rearward outlet sized M10 x 1.0 with a thread pitch of 1.0, and a secondary outlet thread diameter of 10 mm, ensuring compatibility with the vehicle's brake lines. Note that mounting hardware is not included with this part.

Applications and Common Issues Addressed

• Restores proper brake hydraulic pressure for Toyota 4Runner models
• Replaces worn or leaking master cylinders causing brake fluid loss
• Resolves brake pedal sponginess or sinking issues
• Addresses brake warning light activation due to sensor faults
• Improves overall brake system responsiveness and safety

Installation Notes and Tips

Installation of the Dorman M390367 brake master cylinder requires careful attention to brake line connections and sensor wiring. Since mounting hardware is not included, retain or source appropriate fasteners for secure installation. Bleeding the brake system thoroughly after installation is essential to remove air and ensure optimal brake performance. It is recommended to consult the Toyota 4Runner service manual for torque specifications and detailed installation procedures.

Quality Assurance and Warranty

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 under normal driving conditions. While specific warranty details are not provided here, Dorman typically offers limited warranties on their brake hydraulic components. Verify warranty coverage with the product documentation or supplier.