Raybestos MC391068 Brake Master Cylinder

Raybestos MC391068 Brake Master Cylinder

The Raybestos MC391068 is a brake master cylinder for Jeep Wrangler applications from 2007-2018. Built with an aluminum master cylinder body and a 1.000-inch bore, it is specified for vehicles that use two mounting holes and two fluid ports with 7/16"-24 primary and 3/8"-24 secondary thread sizes.

Part of the Raybestos Element3 line, this master cylinder is positioned for direct-fit brake hydraulic service on Jeep Wrangler and Jeep Wrangler JK models. If you are replacing a worn Jeep Wrangler master cylinder, MC391068 provides the core dimensions and port configuration needed for a proper hydraulic match.

Key Features

• Brake master cylinder for Jeep Wrangler and Jeep Wrangler JK fitments
• Raybestos Element3 product line
• Aluminum master cylinder material
• 1.000-inch bore size
• 2 mounting holes with 0.343-inch mounting hole diameter
• 2 ports with 7/16"-24 primary and 3/8"-24 secondary thread sizes
• Cross-references Centric Parts 130.63074 and Dorman - First Stop M630517 for the same application

Product Details

Raybestos MC391068 is a brake master cylinder engineered around the listed bore, port, and mounting specifications for Jeep Wrangler brake hydraulic service. The aluminum construction helps keep the unit lightweight while maintaining the dimensional accuracy needed for a direct replacement in the specified Wrangler and Wrangler JK model years. The Element3 line identifies this as part of Raybestos' brake-focused product range for service replacement applications.

Fits 2018 Jeep Wrangler JK, Raybestos Element 3. Fits 2014-2017 Jeep Wrangler, Raybestos Element 3. Fits 2009-2013 Jeep Wrangler, Rotor Diameter 302 MM; Element3; New. Fits 2007-2008 Jeep Wrangler, Element3; New. Raybestos MC391068 is a direct-reference choice for Jeep Wrangler master cylinder replacement when the vehicle uses the listed port and bore configuration.

What It Helps Address

• Brake pedal travel that feels excessive or inconsistent
• Internal hydraulic leakage in the master cylinder
• Loss of brake pressure at the pedal
• Brake fluid seepage around the master cylinder body or ports
• Restoration of proper hydraulic response during brake service

Installation Notes and Tips

Verify the bore size, mounting hole layout, and port thread sizes against the original unit before installation. Confirm the vehicle year and model match the listed Jeep Wrangler or Jeep Wrangler JK fitment, and inspect the brake hydraulic system for contamination or air before returning the vehicle to service. Proper bleeding is required after master cylinder replacement.

Quality Assurance

Raybestos Element3 brake components are built for service replacement applications with attention to fitment-specific hydraulic dimensions and brake system compatibility. This part cross-references Centric Parts 130.63074 and Dorman - First Stop M630517 for the same application.