Dorman M39981 Brake Master Cylinder

Reliable Brake Master Cylinder for Jeep Cherokee, Comanche, and Wagoneer

The Dorman M39981 brake master cylinder is engineered to restore proper brake hydraulics in select Jeep models. Designed specifically for Jeep Cherokee, Comanche, and Wagoneer vehicles, this master cylinder ensures consistent brake fluid pressure and reliable stopping power.

• Cast iron construction for durability and strength
• Includes reservoir for brake fluid
• Master cylinder bore diameter of 0.938 inches
• Two outlets with rearward outlet size of 7/16-24 and secondary outlet thread diameter of 0.5 inches
• Mounting hardware not included
• Part number M39981 for precise fitment

Detailed Product Description

The Dorman M39981 brake master cylinder is crafted from cast iron, providing a robust and long-lasting component for your Jeep Cherokee, Comanche, or Wagoneer. The included reservoir simplifies installation and maintenance by housing the brake fluid securely. With a bore diameter of 0.938 inches, this master cylinder is designed to deliver consistent hydraulic pressure to your braking system. Featuring two outlets, including a rearward outlet sized at 7/16-24 and a secondary outlet thread diameter of 0.5 inches, it supports proper brake line connections for optimal performance. This part is engineered to meet the specific hydraulic requirements of the listed Jeep models, ensuring compatibility and reliable operation.

Common Applications and Issues Addressed

• Restores brake fluid pressure in Jeep Cherokee, Comanche, and Wagoneer models
• Replaces worn or leaking master cylinders causing brake pedal sponginess
• Solves brake fluid reservoir leaks or contamination issues
• Addresses inconsistent braking performance due to master cylinder failure
• Eliminates brake warning lights related to hydraulic system faults

Installation Notes and Tips

• Ensure brake system is properly bled after installation to remove air
• Verify compatibility with your specific Jeep model and year before installation
• Mounting hardware is not included; retain original hardware or source separately
• Inspect brake lines and fittings for wear or damage during replacement
• Follow manufacturer torque specifications for mounting bolts

Quality Assurance and Warranty

Dorman manufactures the M39981 brake master cylinder to meet or exceed OEM standards for fit, form, and function. The cast iron construction and precise machining contribute to reliable brake system performance. While specific warranty details are not provided here, Dorman typically offers limited warranties on their brake hydraulics components. Consult product documentation or contact the manufacturer for exact warranty terms.