Dorman M39658 Brake Master Cylinder

Overview of the Dorman Brake Master Cylinder M39658

The Dorman Brake Master Cylinder M39658 is designed specifically for Toyota Pickup models, providing reliable brake hydraulics performance. This cast iron master cylinder includes a reservoir and features precise bore and outlet specifications to ensure proper fit and function.

• Compatible with Toyota Pickup vehicles
• Master cylinder bore diameter: 0.938 inches
• Constructed from durable cast iron material
• Includes reservoir for brake fluid
• 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
• Part number: M39658

Detailed Product Description

The Dorman M39658 brake master cylinder is engineered to meet the hydraulic braking needs of Toyota Pickup trucks. Its cast iron construction offers strength and durability under demanding conditions. The master cylinder features a 0.938-inch bore diameter, which is critical for maintaining proper hydraulic pressure within the brake system. This unit comes with an integrated reservoir to hold brake fluid, simplifying installation and maintenance. The two outlet ports, including a rearward outlet sized M10 x 1.0 with a 1.0 thread pitch, allow for secure connection to the brake lines. While mounting hardware is not included, the master cylinder is designed for straightforward replacement in compatible Toyota Pickup models.

Common Applications and Issues Addressed

• Restores proper brake pedal feel and responsiveness
• Eliminates brake fluid leaks from a worn or damaged master cylinder
• Resolves inconsistent braking pressure or spongy brake pedal
• Replaces master cylinders with corroded or cracked cast iron bodies
• Addresses brake system failure due to internal seal wear

Installation Notes and Tips

• Ensure compatibility with your Toyota Pickup model before installation
• Bleed the brake system thoroughly after installation to remove air
• Use appropriate brake fluid as specified by the vehicle manufacturer
• Check all connections for leaks after installation
• Mounting hardware must be sourced separately as it is not included

Quality Assurance and Warranty

Dorman manufactures the M39658 brake master cylinder to meet or exceed OEM specifications for fit, form, and function. The cast iron construction ensures long-lasting durability. While specific warranty details should be confirmed at the point of purchase, Dorman typically offers limited warranties covering defects in materials and workmanship.