Dynamite Friction 644-31108 Disc Brake Rotor - Front

Overview of Dynamite Friction DFC GEOSPEC Coated Rotor

The Dynamite Friction DFC GEOSPEC Coated Rotor - Dimpled and Slotted (part number 644-31108) is engineered for precision braking performance on select BMW models. Designed with vented construction and advanced coating, this rotor supports consistent heat dissipation and corrosion resistance.

• Vented disc brake rotor with dimpled and slotted surface
• Nominal thickness of 30 mm and discard thickness of 28.4 mm
• 340 mm outside diameter and 79 mm inside diameter
• Five bolt holes with 16.6 mm diameter each
• Height of 73.6 mm for proper fitment

Detailed Product Features and Specifications

This disc brake rotor is vented to improve airflow and reduce heat buildup during braking, which helps maintain braking efficiency and rotor longevity. The dimpled and slotted design enhances pad bite and assists in debris and gas removal, contributing to consistent stopping power. The rotor’s nominal thickness is 30 mm, with a discard thickness of 28.4 mm, ensuring safe replacement intervals. With an outside diameter of 340 mm and an inside diameter of 79 mm, it is designed to fit specific BMW models requiring these dimensions. The rotor includes five bolt holes, each 16.6 mm in diameter, to match factory mounting specifications. The height of 73.6 mm ensures compatibility with the brake caliper assembly.

DFC GEOSPEC Coated Rotor - Dimpled and Slotted Product Line

The DFC GEOSPEC Coated Rotor - Dimpled and Slotted line from Dynamite Friction focuses on rotors that combine protective coatings with performance-enhancing surface features. The coating helps resist corrosion and extends rotor life, while the dimpled and slotted pattern improves braking response and heat dissipation. This product line is suitable for drivers seeking rotors that maintain consistent performance under varied driving conditions.

Compatible BMW Models and Applications

• Compatible with BMW 1 Series models including 118i, 120i, M135i, and M140i
• Fits BMW 2 Series models such as 230i, 230i xDrive, M235i, M235i xDrive, M240i, and M240i xDrive
• Suitable for BMW 3 Series including 328i, 330i, 330i xDrive, 335i, 335i xDrive, 335i GT xDrive, 340i, 340i xDrive, and 340i GT xDrive
• Compatible with BMW 4 Series models like 428i, 428i xDrive, 428i Gran Coupe, 428i xDrive Gran Coupe, 430i, 430i xDrive, 430i Gran Coupe, 430i xDrive Gran Coupe, 435i, 435i xDrive, 435i Gran Coupe, 435i xDrive Gran Coupe, 440i, 440i xDrive, 440i Gran Coupe, and 440i xDrive Gran Coupe
• Also fits BMW ActiveHybrid 3

Common Issues Addressed by This Rotor

• Brake fade caused by excessive heat buildup
• Uneven brake pad wear due to rotor surface imperfections
• Corrosion and rust on rotor surfaces affecting braking performance
• Vibration or pulsation during braking from warped rotors
• Reduced braking efficiency from glazed or contaminated rotors

Installation Notes and Tips

• Ensure rotor discard thickness of 28.4 mm is not exceeded before replacement
• Verify bolt hole alignment and diameter (16.6 mm) for proper mounting
• Clean rotor surface before installation to remove any protective coatings or residues
• Use proper torque specifications for the five mounting bolts to avoid rotor warping
• Inspect brake pads and calipers during installation for optimal system performance

Quality Assurance and Warranty

Dynamite Friction rotors, including the DFC GEOSPEC Coated Rotor - Dimpled and Slotted (part number 644-31108), are manufactured to meet OEM standards for fit and function. The vented design and coating contribute to durability and corrosion resistance. Please refer to Dynamite Friction’s warranty policy for specific coverage details.