Raybestos 781138 Disc Brake Rotor - Rear

Reliable Disc Brake Rotor for Ram ProMaster Trucks

The Raybestos Specialty - Truck Disc Brake Rotor 781138 is engineered for dependable braking performance on Ram ProMaster 1500, 2500, 3500, and ProMaster Rapid models. Designed to meet the demands of commercial and heavy-duty use, this vented rotor ensures consistent heat dissipation and durability.

• Compatible with Ram ProMaster 1500, 2500, 3500, and ProMaster Rapid
• Part Number: 781138
• Vented disc brake rotor with smooth surface finish
• Overall height: 3.150 inches (80.000 mm)
• Outside diameter: 11.803 inches (299.800 mm)
• Inside diameter: 7.874 inches (200.000 mm)
• Mounting bolt hole quantity: 5 with 0.693 inch (17.600 mm) diameter holes
• Nominal thickness: 0.866 inches (22.000 mm), discard thickness: 0.748 inches (19.000 mm)
• Center hole diameter: 3.110 inches (79.000 mm)
• Mounting bolt hole circle diameter: 5.118 inches (130.000 mm)
• Conventional rotor type suitable for drum-in-hat applications

Detailed Product Description

This Raybestos Specialty - Truck disc brake rotor, part number 781138, is designed specifically for Ram ProMaster series trucks, including the 1500, 2500, 3500, and ProMaster Rapid. The rotor features a vented design that improves heat dissipation during braking, reducing the risk of brake fade under heavy loads or extended use. The smooth surface finish ensures consistent pad contact and braking efficiency.

With an outside diameter of 11.803 inches and an overall height of 3.150 inches, this rotor fits the specified Ram ProMaster models precisely. The nominal thickness of 0.866 inches and discard thickness of 0.748 inches provide clear service limits to maintain safe braking performance. The rotor includes five mounting bolt holes with a 5.118-inch bolt circle diameter, matching the factory specifications for secure installation.

Raybestos Specialty - Truck Product Line

The Specialty - Truck line by Raybestos focuses on heavy-duty and commercial vehicle applications, offering components engineered to withstand the rigorous demands of truck use. This product line emphasizes durability and performance, making it suitable for Ram ProMaster trucks that require reliable braking under load and frequent use.

Common Applications and Problem Solving

• Replacement for worn or warped rotors on Ram ProMaster 1500, 2500, 3500, and ProMaster Rapid
• Addresses brake fade caused by overheating during heavy-duty operation
• Resolves uneven braking or vibration due to rotor thickness variation
• Restores proper rotor thickness to maintain braking efficiency and safety
• Suitable for conventional drum-in-hat brake systems on specified Ram models

Installation Notes and Tips

• Verify rotor dimensions and bolt pattern match your Ram ProMaster model before installation
• Inspect brake pads and calipers for wear or damage during rotor replacement
• Ensure mounting surfaces are clean and free of debris to prevent rotor misalignment
• Torque mounting bolts to manufacturer specifications to avoid rotor warping
• Check rotor thickness regularly to determine when replacement is necessary

Quality Assurance and Warranty

Raybestos disc brake rotors are manufactured to meet strict quality standards for durability and performance. The Specialty - Truck line is designed to provide consistent braking under demanding conditions. While specific warranty details are not provided here, Raybestos products typically come with a limited warranty against defects in materials and workmanship. Consult product documentation or the manufacturer for exact warranty terms.