Dorman M34403 Brake Master Cylinder

Reliable Brake Master Cylinder Replacement for Your Vehicle

The Dorman M34403 brake master cylinder is designed to restore proper brake hydraulics in compatible vehicles. Featuring a durable cast iron construction and an included reservoir, this master cylinder supports consistent brake fluid pressure for safe stopping performance.

• Master cylinder bore diameter: 1.125 inches
• Constructed from cast iron for durability
• Includes reservoir for brake fluid
• Single outlet design with 7/16-24 rearward outlet size
• Mounting hardware not included

Durable Cast Iron Master Cylinder with Integrated Reservoir

The Dorman M34403 master cylinder is engineered with a 1.125-inch bore diameter to provide precise hydraulic pressure control. Its cast iron body offers strength and resistance to wear, ensuring long service life under demanding braking conditions. The included reservoir simplifies installation by providing a ready-to-use brake fluid container, while the single outlet with a 7/16-24 rearward fitting supports standard brake line connections. This master cylinder is suitable for vehicles requiring a reliable replacement part to maintain brake system integrity.

Common Applications and Problem Resolution

• Restores brake fluid pressure in vehicles with failing master cylinders
• Eliminates spongy or unresponsive brake pedal feel
• Prevents brake fluid leaks from worn or damaged master cylinders
• Addresses brake system failure due to internal cylinder wear
• Supports consistent brake performance in daily driving conditions

Installation Notes and Tips

When installing the Dorman M34403 brake master cylinder, ensure the brake system is properly bled to remove air and maintain hydraulic integrity. Since mounting hardware is not included, retain original fasteners or source compatible hardware. Verify the rearward outlet size of 7/16-24 matches your vehicle’s brake line fittings for a secure connection. Proper installation is critical to restore full braking function and safety.

Quality Assurance and Warranty Information

Dorman manufactures the M34403 brake master cylinder to meet or exceed OEM specifications for fit and function. The cast iron construction and integrated reservoir are designed for durability and reliable performance. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in materials and workmanship to provide confidence in your replacement part.