Dorman M544 Brake Master Cylinder

Reliable Brake Master Cylinder Replacement for Your Vehicle

The Dorman M544 brake master cylinder is engineered to restore proper brake hydraulics in select vehicles. Designed with a durable cast iron body and an integrated reservoir, this master cylinder ensures consistent brake fluid delivery and pressure for safe stopping performance.

• Master cylinder bore diameter: 1.25 inches for precise hydraulic control
• Constructed from cast iron for long-lasting durability
• Includes reservoir for brake fluid storage
• Features three outlets with varied thread sizes: 3/8-18 NPT rearward outlet, 1/4-18 NPT and 1/8-27 NPT secondary outlets
• Package contains the master cylinder unit only; mounting hardware not included

Detailed Product Overview

The Dorman M544 brake master cylinder is a critical component in the brake hydraulics system, responsible for converting pedal force into hydraulic pressure. Its 1.25-inch bore diameter allows for accurate fluid displacement, while the cast iron construction provides resistance to wear and corrosion. The integrated reservoir simplifies installation and maintenance by holding the brake fluid necessary for system operation. With three outlets designed to accommodate various brake line connections, this master cylinder supports complex brake system configurations commonly found in vehicles such as Chevrolet trucks and GMC SUVs.

Common Applications and Problem Resolution

This master cylinder is compatible with a range of Chevrolet and GMC models requiring a 1.25-inch bore diameter brake master cylinder. It addresses several brake system issues, including:

• Spongy or unresponsive brake pedal feel
• Brake fluid leaks from the master cylinder or reservoir
• Brake warning light activation due to hydraulic pressure loss
• Uneven brake application or pulling during stops
• Brake pedal sinking or failure to maintain pressure

Installation Notes and Tips

When installing the Dorman M544 master cylinder, ensure the brake system is properly bled to remove air and restore hydraulic integrity. Since mounting hardware is not included, retain or source compatible bolts and fittings. Verify thread sizes for brake line connections: the rearward outlet uses a 3/8-18 NPT thread, while secondary outlets use 1/4-18 NPT and 1/8-27 NPT threads. Proper torque specifications should be followed to prevent leaks and ensure secure mounting.

Quality Assurance and Warranty Information

Dorman manufactures the M544 brake master cylinder to meet or exceed OEM standards for fit, form, and function. The cast iron material and integrated reservoir design contribute to reliable performance under normal operating conditions. While specific warranty details vary, Dorman typically offers a limited warranty covering defects in materials and workmanship. Consult product documentation or contact the manufacturer for exact warranty terms.