Raybestos MC391385 Brake Master Cylinder

Raybestos MC391385 Brake Master Cylinder

The Raybestos Element3 New brake master cylinder is built for direct replacement service on select Jeep applications. This aluminum master cylinder features a 1.060 bore, two mounting holes, and two fluid ports for a precise hydraulic connection.

Compatible with Jeep Wrangler and Jeep Liberty applications, the Raybestos MC391385 supports vehicles equipped with a 13.07-inch front rotor where specified. The Element3 New line focuses on replacement parts that match the required fit and hydraulic layout for service work.

Key Features

• Brake master cylinder for hydraulic brake system repair
• Aluminum master cylinder construction
• 1.060 bore size for the specified application
• 2 mounting holes with 0.342 mounting hole diameter
• 2 ports with 7/16"-24 primary port thread and 3/8"-24 secondary port thread
• Raybestos Element3 New product line
• Part number MC391385

Detailed Description

Raybestos MC391385 is a brake master cylinder engineered for select Jeep Wrangler and Jeep Liberty vehicles. The aluminum body helps keep the unit lightweight while maintaining the hydraulic configuration required by the application. With a 1.060 bore and two-port design, this master cylinder is specified for vehicles that use the listed port thread sizes and mounting pattern. This part cross-references Cardone New 13-4333 for the same application.

The Raybestos Element3 New line is positioned as a replacement solution for brake service where correct fitment and hydraulic port layout matter. Use MC391385 when replacing a worn or leaking master cylinder on compatible Jeep Wrangler and Jeep Liberty models.

What It Helps Fix

• Brake pedal that sinks or feels inconsistent
• External brake fluid leakage at the master cylinder
• Loss of hydraulic pressure in the brake system
• Uneven or delayed brake response
• Brake warning concerns related to master cylinder wear

Installation Notes and Tips

• Verify the bore size, port threads, and mounting hole layout before installation.
• Confirm vehicle fitment by year, model, and front rotor specification where listed.
• Inspect brake lines and hydraulic connections for wear before transferring the new master cylinder into service.
• Bleed the brake system thoroughly after installation to remove trapped air.
• Check for leaks and proper pedal feel before returning the vehicle to road use.

Quality Assurance

Raybestos brake hydraulics are built to meet the dimensional and application requirements of the listed vehicles. MC391385 is part of the Element3 New line and is intended for direct replacement use on the confirmed Jeep Wrangler and Jeep Liberty fitments.