Dorman M39366 Brake Master Cylinder

Reliable Brake Master Cylinder for Jeep CJ5, CJ7, and Scrambler

The Dorman M39366 brake master cylinder is designed to restore proper brake hydraulics for Jeep CJ5, CJ7, and Scrambler models. Engineered with durable cast iron and a 1-inch bore diameter, this master cylinder includes a reservoir to ensure consistent brake fluid supply.

• Compatible with Jeep CJ5, CJ7, and Scrambler models
• Constructed from durable cast iron for long-lasting performance
• Includes reservoir for brake fluid management
• Features two outlets with rearward outlet size 1/2-20 and secondary outlet thread diameter 9/16-18
• Does not include mounting hardware or sensor
• Part number M39366 for precise identification

Technical Details and Specifications

The Dorman M39366 brake master cylinder features a 1-inch bore diameter, providing the necessary hydraulic pressure for effective braking. Made from cast iron, the master cylinder offers strength and resistance to wear. It includes a reservoir to maintain brake fluid levels, ensuring consistent brake system performance. The unit has two outlets: a rearward outlet sized at 1/2-20 and a secondary outlet with a 9/16-18 thread diameter, compatible with the brake lines on Jeep CJ5, CJ7, and Scrambler vehicles. Note that mounting hardware and sensors are not included with this part.

Common Applications and Problem Resolution

• Restores brake pressure loss in Jeep CJ5, CJ7, and Scrambler models
• Replaces leaking or damaged master cylinders causing brake fluid loss
• Addresses spongy or unresponsive brake pedal issues
• Fixes brake system failures related to worn internal seals
• Improves overall brake system reliability and safety

Installation Notes and Tips

Installation of the Dorman M39366 brake master cylinder requires proper brake system bleeding to remove air and ensure optimal performance. Since mounting hardware is not included, retain or source compatible fasteners for secure installation. Verify outlet thread sizes (1/2-20 rearward and 9/16-18 secondary) to match existing brake lines on Jeep CJ5, CJ7, or Scrambler models. Professional installation is recommended for safety and compliance with vehicle specifications.

Quality Assurance and Warranty Information

Dorman manufactures the M39366 brake master cylinder to meet or exceed OEM standards for fit and function. The cast iron construction ensures durability under demanding conditions. While specific warranty details are not provided here, Dorman typically offers limited warranties on their brake hydraulics products. Refer to official Dorman documentation for warranty terms applicable to this part.