Dynamite Friction 631-31108L Disc Brake Rotor - Front Left

Overview of Dynamite Friction DFC Brake Rotor

The Dynamite Friction DFC Brake Rotor - Drilled and Slotted - Silver (part number 631-31108L) is engineered for BMW models requiring reliable braking performance. Designed with a vented, directional surface, this rotor enhances heat dissipation and braking consistency for vehicles such as the BMW 328i, 335i, and 440i xDrive.

• Vented disc brake rotor with drilled and slotted surface
• Silver zinc-coated hat finish for corrosion resistance
• Directional braking surface optimized for heat and debris management
• Nominal thickness of 30 mm with discard thickness at 28.4 mm
• Fits BMW models with 5 lug holes and 120 mm bolt circle diameter
• Overall diameter of 340 mm and height of 73.6 mm
• Rust resistant coating for extended rotor life

About the DFC Brake Rotor - Drilled and Slotted - Silver Line

The DFC Brake Rotor - Drilled and Slotted - Silver line by Dynamite Friction focuses on delivering rotors with enhanced cooling and braking efficiency. Featuring a combination of drilled holes and precision slots, this product line is designed to reduce brake fade and improve pad bite under demanding driving conditions. The silver zinc hat finish adds a layer of rust protection, making it suitable for BMW vehicles exposed to various weather conditions.

Technical Specifications and Features

This disc brake rotor is vented to allow better airflow, which helps dissipate heat generated during braking. The rotor’s surface is both drilled and slotted, providing improved water and gas evacuation to maintain consistent braking performance. The directional design ensures optimal contact with brake pads, enhancing stopping power and reducing noise. With a bolt hole diameter of 16.6 mm and a bolt circle diameter of 120 mm, it fits BMW models equipped with 5 lug nuts. The rotor’s nominal thickness is 30 mm, with a discard thickness of 28.4 mm, ensuring safe replacement intervals.

Compatible BMW Models and Applications

• BMW 118i, 120i, 228i, 230i, 320i, 328i, 330i, 335i, 340i, 428i, 430i, 435i, 440i series
• BMW xDrive variants including 228i xDrive, 328d xDrive, 335i xDrive, 340i xDrive, 428i xDrive, 430i xDrive, 435i xDrive, 440i xDrive
• BMW Gran Coupe and ActiveHybrid 3 models
• BMW M135i, M140i, M235i, M240i and their xDrive versions

Common Issues Addressed by This Rotor

• Brake fade caused by excessive heat buildup during aggressive driving
• Uneven pad wear due to poor rotor surface design
• Corrosion and rust on rotor hats affecting longevity
• Reduced braking efficiency in wet conditions
• Brake noise and vibration from warped or worn rotors

Installation Notes and Tips

Ensure the rotor surface is clean and free of any protective coatings before installation. Verify that the rotor thickness meets or exceeds the discard thickness of 28.4 mm to maintain safety standards. Use proper torque specifications for the 5 lug nuts on the 120 mm bolt circle diameter. It is recommended to replace brake pads simultaneously to ensure optimal braking performance. Directional rotors must be installed with the correct rotation direction as indicated by the rotor design.

Quality Assurance and Warranty

Dynamite Friction manufactures the 631-31108L rotor to meet or exceed OEM specifications for fit, form, and function. The rust resistant zinc silver hat finish and rust resistant coating contribute to extended rotor life. While specific warranty details are not provided, Dynamite Friction products typically undergo rigorous quality control to ensure durability and performance on BMW vehicles.