Dorman M39500 Brake Master Cylinder

Reliable Brake Master Cylinder for Toyota 4Runner and Pickup

The Dorman M39500 brake master cylinder is engineered to restore proper brake hydraulics in Toyota 4Runner and Pickup models. Designed with durable cast iron and equipped with a reservoir and sensor, this master cylinder ensures consistent braking performance.

• Master cylinder bore diameter: 0.813 inches for precise hydraulic pressure
• Constructed from cast iron for strength and durability
• Includes reservoir for brake fluid storage
• Equipped with a sensor to monitor 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

Detailed Description of Dorman M39500 Brake Master Cylinder

This brake master cylinder is specifically designed for Toyota 4Runner and Pickup vehicles, providing a direct replacement for the original part. The cast iron construction offers long-lasting durability under demanding braking conditions. The 0.813-inch bore diameter allows for accurate hydraulic pressure control, essential for safe and responsive braking. The included reservoir holds brake fluid, while the integrated sensor helps monitor the brake system's condition, supporting vehicle safety systems. With two outlets and precise thread specifications (M10 x 1.0, pitch 1.0), this master cylinder fits seamlessly into the brake hydraulics system of compatible Toyota models.

Common Issues Addressed by This Brake Master Cylinder

• Brake pedal sinking or sponginess due to internal leaks
• Brake fluid leaks from a worn or damaged master cylinder
• Loss of hydraulic pressure affecting braking performance
• Faulty brake fluid level sensor triggering warning lights
• Inconsistent brake response in Toyota 4Runner and Pickup models

Installation Notes and Tips

Installation of the Dorman M39500 brake master cylinder requires careful attention to brake system bleeding to remove air and ensure proper hydraulic function. Mounting hardware is not included, so reuse existing hardware or acquire appropriate fasteners. Verify thread sizes and outlet fittings match your vehicle’s brake lines. It is recommended to inspect related brake components during installation for optimal system performance.

Quality Assurance and Warranty Information

Dorman manufactures the M39500 brake master cylinder to meet or exceed OEM specifications for Toyota 4Runner and Pickup vehicles. The cast iron material and integrated sensor contribute to reliable operation. While specific warranty details should be confirmed at purchase, Dorman typically offers limited warranties covering defects in materials and workmanship.