Raybestos 66840 Disc Brake Rotor - Rear

Raybestos Specialty - Street Performance Disc Brake Rotor Overview

The Raybestos Specialty - Street Performance disc brake rotor 66840 is engineered for reliable braking performance on select Ford, Jaguar, and Lincoln vehicles. Designed as a vented, conventional rotor, it offers consistent heat dissipation and durability for street driving conditions.

• Vented disc brake rotor for improved cooling
• Overall height: 1.275 inches (32.400 mm)
• Outside diameter: 11.335 inches (287.900 mm)
• Nominal thickness: 0.790 inches (20.050 mm)
• Discard thickness: 0.728 inches (18.500 mm)
• Mounting bolt hole quantity: 5 with 4.250 inch (107.950 mm) bolt circle diameter
• Center hole diameter: 2.538 inches (64.450 mm)
• Compatible with 5 stud/lug hole configurations

Detailed Product Specifications

This Raybestos disc brake rotor, part number 66840, features a vented design that enhances heat dissipation during braking, reducing the risk of brake fade under normal street performance conditions. The rotor's nominal thickness of 0.790 inches ensures structural integrity, while the discard thickness of 0.728 inches indicates the minimum safe thickness before replacement is necessary. With an overall height of 1.275 inches and an outside diameter of 11.335 inches, this rotor fits vehicles requiring these precise dimensions. The 5 mounting bolt holes arranged on a 4.250 inch bolt circle diameter provide secure attachment, and the 2.538 inch center hole diameter ensures proper hub fitment.

Specialty - Street Performance Product Line

The Raybestos Specialty - Street Performance line focuses on delivering rotors designed for street-driven vehicles that demand dependable braking without the need for racing-grade components. This product line balances performance and durability, making it suitable for vehicles like the Ford Thunderbird, Jaguar XJ8, and Lincoln LS, where consistent braking response is essential for everyday driving.

Compatible Vehicles and Applications

• Ford Thunderbird
• Jaguar S-Type, XJ8, XJR
• Lincoln LS, Vanden Plas

Part number 66840 is specifically designed to meet the braking requirements of these models, ensuring proper fit and function.

Common Issues Addressed by This Rotor

• Brake rotor warping due to heat buildup
• Reduced braking efficiency from worn or thin rotors
• Brake noise caused by uneven rotor surfaces
• Vibration or pulsation during braking
• Corrosion and surface damage affecting rotor performance

Installation Notes and Tips

When installing the Raybestos 66840 rotor, ensure the mounting surface is clean and free of debris to prevent uneven rotor seating. Verify the rotor thickness before installation to confirm it meets or exceeds the discard thickness specification of 0.728 inches. Use proper torque specifications on the 5 mounting bolts to avoid rotor distortion. It is recommended to replace brake pads simultaneously to maintain optimal braking performance.

Quality Assurance and Warranty

Raybestos manufactures this rotor to meet or exceed OEM specifications for fit, form, and function. The Specialty - Street Performance rotors undergo rigorous quality control to ensure durability and consistent braking performance. Warranty details are provided by Raybestos and typically cover defects in materials and workmanship under normal use conditions.