Dorman M39577 Brake Master Cylinder

Reliable Brake Master Cylinder Replacement for Your Vehicle

The Dorman M39577 brake master cylinder is engineered to restore proper brake hydraulics performance in compatible vehicles. Designed with a durable cast iron construction and a 1.75-inch bore diameter, this master cylinder ensures consistent brake fluid pressure for safe stopping power.

• Cast iron master cylinder material for durability
• Includes reservoir for brake fluid storage
• 1.75-inch bore diameter for precise hydraulic control
• Two outlets with secondary outlet thread diameter of 0.5 inches
• Rearward outlet size of 9/16-18 for secure brake line connections
• Does not include mounting hardware or sensors

Detailed Product Features and Specifications

The Dorman M39577 brake master cylinder features a cast iron body that provides strength and resistance to wear under high-pressure brake system conditions. The included reservoir allows for proper brake fluid containment and monitoring. With a master cylinder bore diameter of 1.75 inches, this part is designed to deliver consistent hydraulic pressure to the brake calipers or wheel cylinders. It has two outlets, including a secondary outlet with a 0.5-inch thread diameter and a rearward outlet sized at 9/16-18, ensuring compatibility with specific brake line fittings. This master cylinder does not come with mounting hardware or sensors, so verify your vehicle’s requirements before installation.

Common Applications and Problem Resolution

• Restores brake fluid pressure in vehicles experiencing spongy or unresponsive brakes
• Replaces leaking or damaged master cylinders causing brake fluid loss
• Addresses brake pedal sinking or failure to maintain pressure
• Solves issues related to inconsistent brake performance or uneven braking
• Suitable for vehicles requiring a 1.75-inch bore diameter master cylinder with reservoir

Installation Notes and Tips

Before installing the Dorman M39577 brake master cylinder, ensure the brake system is properly bled to remove air pockets. Since mounting hardware is not included, retain or source the correct fasteners for your vehicle. Verify the brake line fittings match the 0.5-inch secondary outlet thread diameter and 9/16-18 rearward outlet size to ensure a secure connection. Properly torque all fittings and check for leaks after installation.

Quality Assurance and Warranty Information

Dorman manufactures the M39577 brake master cylinder to meet or exceed OEM standards for brake hydraulics components. The cast iron construction and included reservoir are designed for long-term reliability. Please consult Dorman’s warranty policy for specific coverage details related to this part number.