Dorman M390365 Brake Master Cylinder

Overview of Dorman Brake Master Cylinder M390365

The Dorman Brake Master Cylinder M390365 is designed specifically for Toyota Land Cruiser and Lexus LX450 models. This aluminum master cylinder includes a reservoir and sensor, engineered to maintain reliable brake hydraulics performance.

• Master cylinder bore diameter: 1 inch
• Constructed from durable aluminum material
• Includes reservoir for fluid storage
• Equipped with sensor for brake system monitoring
• Two outlets with rearward outlet size M10 x 1.0 and thread pitch 1.0
• Secondary outlet thread diameter: 10 mm
• Mounting hardware not included

Detailed Product Description

The Dorman M390365 brake master cylinder is a precision-engineered component made from aluminum to provide strength and corrosion resistance. It features a 1-inch bore diameter, which is critical for maintaining proper hydraulic pressure in the brake system. The included reservoir allows for brake fluid storage and easy monitoring, while the integrated sensor supports electronic brake system diagnostics. With two outlets, including a rearward outlet sized M10 x 1.0 and a secondary outlet thread diameter of 10 mm, this master cylinder is designed to meet the exact specifications required by Toyota Land Cruiser and Lexus LX450 vehicles. Note that mounting hardware is not included, so ensure compatibility with existing brake system components during installation.

Compatible Vehicles and Applications

This brake master cylinder is compatible with the following vehicles:

• Toyota Land Cruiser
• Lexus LX450

It is intended for use in brake hydraulic systems where reliable pressure generation and fluid management are essential for safe braking performance.

Common Issues Addressed by This Master Cylinder

• Brake pedal sinking or sponginess due to internal leaks
• Brake fluid reservoir leaks or damage
• Faulty brake system sensor readings
• Inconsistent hydraulic pressure affecting braking response
• Wear or corrosion in original master cylinder components

Installation Notes and Tips

• Verify compatibility with Toyota Land Cruiser or Lexus LX450 before installation
• Ensure brake fluid reservoir is properly filled and free of contaminants
• Bleed the brake system thoroughly after installation to remove air
• Check sensor connections for secure fit and proper function
• Use existing mounting hardware or source compatible hardware as it is not included

Quality Assurance and Warranty

Dorman manufactures this brake master cylinder to meet or exceed OEM specifications for fit, form, and function. The aluminum construction provides durability and resistance to corrosion. This part includes a sensor to support brake system diagnostics. Warranty coverage details should be confirmed with the point of purchase or manufacturer documentation.