Dorman M39403 Brake Master Cylinder

Reliable Brake Master Cylinder for Toyota Pickup

The Dorman M39403 brake master cylinder is engineered to restore proper brake hydraulics in your Toyota Pickup. Designed with durable cast iron and a precise 0.938-inch bore diameter, this master cylinder ensures consistent brake fluid pressure for safe stopping performance.

• Cast iron master cylinder material for strength and durability
• Includes reservoir for brake fluid storage
• Two outlet ports with rearward outlet size M10 x 1.0 and 10mm secondary outlet thread diameter
• Thread pitch of 1.0 for secure hydraulic connections
• Compatible specifically with Toyota Pickup models

Product Details and Specifications

The Dorman M39403 brake master cylinder features a 0.938-inch bore diameter, which is critical for maintaining the correct hydraulic pressure in the brake system. Constructed from cast iron, this master cylinder offers long-lasting resistance to wear and corrosion. It comes with an integrated reservoir to hold brake fluid, eliminating the need for a separate component. The unit has two outlets, including a rearward outlet sized M10 x 1.0 and a secondary outlet with a 10mm thread diameter, both designed to fit the brake lines of Toyota Pickup vehicles precisely. The thread pitch of 1.0 ensures a tight and leak-free connection.

Common Applications and Problem Resolution

• Restores brake fluid pressure in Toyota Pickup brake systems
• Replaces worn or leaking master cylinders causing brake pedal issues
• Solves brake fluid reservoir leaks or contamination problems
• Addresses inconsistent brake pedal feel or sponginess
• Fixes brake system failures related to master cylinder wear

Installation Notes and Tips

When installing the Dorman M39403 brake master cylinder on your Toyota Pickup, ensure the brake lines match the specified outlet thread sizes (M10 x 1.0 and 10mm). Bleed the brake system thoroughly after installation to remove air and restore proper hydraulic pressure. Note that mounting hardware is not included, so retain original fasteners or acquire appropriate replacements. Proper torque specifications should be followed to avoid leaks or damage.

Quality Assurance and Warranty

Dorman manufactures the M39403 brake master cylinder to meet or exceed OEM standards for fit, form, and function. The cast iron construction and integrated reservoir contribute to reliable brake system performance. While specific warranty details are not provided, Dorman products typically come with a limited warranty covering defects in materials and workmanship.