Dorman M390236 Brake Master Cylinder

Reliable Brake Master Cylinder for Toyota 4Runner

The Dorman M390236 brake master cylinder is engineered to restore proper brake hydraulics for Toyota 4Runner models. Designed with precision, this aluminum master cylinder includes a reservoir and sensor to ensure consistent brake performance and safety.

• Master cylinder bore diameter: 1.063 inches 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

The Dorman M390236 brake master cylinder is specifically designed for Toyota 4Runner vehicles, ensuring compatibility and reliable fitment. Its 1.063-inch bore diameter provides the correct hydraulic pressure needed for effective braking. The aluminum construction offers corrosion resistance and durability under demanding conditions. This master cylinder comes with an integrated reservoir to hold brake fluid and a sensor to monitor brake system status, supporting vehicle safety systems. Featuring two outlets, including a rearward outlet sized M10 x 1.0 with a 1.0 thread pitch, it facilitates proper brake line connections. Note that mounting hardware is not included, so ensure you have the necessary components for installation.

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 proper brake system sensor functionality for warning light accuracy
• Addresses brake failure symptoms related to master cylinder malfunction

Installation Notes and Tips

• Compatible with Toyota 4Runner models; verify vehicle year and specifications before installation
• Bleed the brake system thoroughly after installation to remove air and ensure proper hydraulic pressure
• Use appropriate brake fluid as specified by the vehicle manufacturer
• Inspect brake lines and fittings for wear or damage during installation
• Mounting hardware is not included; retain original hardware or source compatible replacements

Quality Assurance and Warranty

Dorman manufactures the M390236 brake master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction and integrated sensor contribute to long-term reliability. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in material and workmanship. Consult product documentation or contact the manufacturer for exact warranty terms.