Raybestos 781138 Disc Brake Rotor - Rear

Raybestos Rear Vented Disc Brake Rotor

The Raybestos Specialty - Truck 781138 is a rear disc brake rotor built for select Ram ProMaster applications that use a vented rotor design. With a smooth surface and conventional rotor construction, it supports consistent brake contact and service replacement for the specified vehicles.

For Ram ProMaster 1500, Ram ProMaster 2500, and Ram ProMaster 3500 rear brake service, this rotor matches the listed dimensions and fitment requirements. The Raybestos 781138 is also listed for the Ram ProMaster Rapid rear application noted in the fitment data.

Key Features

• Rear disc brake rotor for select Ram ProMaster and Ram ProMaster Rapid applications
• Vented rotor design for the listed fitments
• Smooth surface type for brake pad contact
• Conventional rotor construction, not drum-in-hat style
• Outside diameter: 11.803 in. / 299.800 mm
• Nominal thickness: 0.866 in. / 22.000 mm
• Discard thickness: 0.748 in. / 19.000 mm
• Center hole diameter: 3.110 in. / 79.000 mm
• Mounting bolt hole circle diameter: 5.118 in. / 130.000 mm
• 5 mounting bolt holes and 5 stud/lug holes

Detailed Description

Raybestos Specialty - Truck brake components are focused on truck and van service applications, and the 781138 rotor follows that approach with application-specific sizing and vented construction. This rotor is engineered around the listed dimensions, including an overall height of 3.150 in. / 80.000 mm and a 17.600 mm mounting bolt hole diameter, to match the rear brake setup used on the covered Ram vehicles. This part number, 781138, is a direct replacement-style rotor for the specified rear positions.

This part cross-references DuraGo BR901278 and PowerStop AR8395EVC for the same application.

What It Helps Address

• Brake pulsation caused by a worn or out-of-spec rear rotor
• Reduced braking consistency from rotor surface wear
• Noise related to uneven rotor contact
• Service replacement needs on rear brake maintenance
• Fitment issues when the vehicle requires a vented rear rotor

Installation Notes and Tips

Verify rotor dimensions, bolt pattern, and vented construction before installation. This rotor is listed for rear position use on 2014-2021 Ram ProMaster 1500, 2014-2021 Ram ProMaster 2500, 2014-2021 Ram ProMaster 3500, and 2017 Ram ProMaster Rapid. The fitment notes specify vented rotor requirements for the Ram ProMaster applications, so confirm the vehicle’s rear brake configuration matches the listing before service.

For best results, inspect pads, caliper condition, and hub mounting surfaces during brake service. Proper cleaning of the hub face helps support even rotor seating and consistent brake operation.

Quality Assurance

Raybestos is a recognized brake brand with a Specialty - Truck product line focused on truck and van brake service applications. The 781138 rotor is built to the listed specifications for the confirmed vehicle applications and is identified by Raybestos part number 781138.