Dorman M12430 Brake Master Cylinder

Reliable Brake Master Cylinder Replacement for Your Vehicle

The Dorman M12430 brake master cylinder is engineered to restore proper brake hydraulics performance in compatible vehicles. Designed with a durable cast iron construction and integrated reservoir, this master cylinder ensures consistent braking response and safety.

• Master cylinder bore diameter: 1.75 inches for precise hydraulic pressure
• Constructed from cast iron for long-lasting durability
• Includes reservoir for brake fluid storage
• Equipped with a sensor to monitor brake system status
• Two outlets with secondary outlet thread diameter of 0.5 inches and rearward outlet size of 9/16-18
• Package contains the master cylinder unit only

Detailed Product Features and Specifications

The Dorman M12430 brake master cylinder features a 1.75-inch bore diameter, which is critical for maintaining the correct hydraulic pressure within the brake system. Its cast iron material provides strength and resistance to wear, ensuring reliable operation over time. The included reservoir allows for proper brake fluid containment and circulation, while the integrated sensor helps monitor brake fluid levels or system performance, depending on vehicle configuration. This master cylinder has two outlets, including a secondary outlet with a 0.5-inch thread diameter and a rearward outlet sized at 9/16-18, facilitating compatibility with specific brake line fittings.

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 spongy or unresponsive brake pedal feel
• Addresses brake warning light activation related to master cylinder sensor issues
• Replaces corroded or cracked cast iron master cylinders in older vehicles

Installation Notes and Tips

When installing the Dorman M12430 brake master cylinder, ensure the brake fluid reservoir is properly filled and free of contaminants. Bleed the brake system thoroughly to remove air pockets and verify that all outlet connections match the specified thread sizes (0.5 inch secondary outlet and 9/16-18 rearward outlet). Use appropriate brake fluid as recommended by the vehicle manufacturer. Note that mounting hardware is not included and must be reused or sourced separately.

Quality Assurance and Warranty Information

Dorman manufactures the M12430 brake master cylinder to meet or exceed OEM standards for fit, form, and function. The cast iron construction and integrated sensor are tested for durability and performance. This part is backed by Dorman's limited warranty, providing coverage against defects in material and workmanship under normal use conditions.