Dynamite Friction 644-31112 Disc Brake Rotor - Front

Overview of Dynamite Friction DFC GEOSPEC Coated Rotor

The Dynamite Friction DFC GEOSPEC Coated Rotor - Dimpled and Slotted (part number 644-31112) is engineered for BMW models including the 335i, 340i, 435i, 440i, and ActiveHybrid 3 series. This vented disc brake rotor offers enhanced heat dissipation and consistent braking performance under demanding conditions.

• Compatible with BMW 335i, 335i xDrive, 340i, 340i xDrive, 435i, 435i Gran Coupe, 435i xDrive, 435i xDrive Gran Coupe, 440i, 440i Gran Coupe, 440i xDrive, 440i xDrive Gran Coupe, and ActiveHybrid 3
• Part Number: 644-31112
• Vented rotor design for improved cooling
• Dimpled and slotted surface for enhanced brake pad bite and debris removal
• Nominal thickness of 30 mm with a discard thickness of 28.4 mm
• Outside diameter of 370 mm and inside diameter of 79 mm
• Five bolt holes with a diameter of 16.5 mm
• Height of 73.3 mm

Detailed Product Description

The DFC GEOSPEC Coated Rotor - Dimpled and Slotted from Dynamite Friction is designed to meet the specific braking requirements of select BMW vehicles. Its vented construction allows air to flow between the rotor surfaces, reducing heat buildup during braking and helping to maintain consistent stopping power. The dimpled and slotted rotor surface improves pad contact and helps evacuate gases, dust, and water, which can otherwise reduce braking efficiency.

With a nominal thickness of 30 mm and a discard thickness of 28.4 mm, this rotor provides a balance between durability and performance. The 370 mm outside diameter and 79 mm inside diameter ensure proper fitment and compatibility with the specified BMW models. The rotor features five bolt holes, each with a diameter of 16.5 mm, matching the factory specifications for secure installation.

DFC GEOSPEC Coated Rotor - Dimpled and Slotted Product Line

The DFC GEOSPEC Coated Rotor - Dimpled and Slotted line by Dynamite Friction focuses on rotors that combine advanced surface treatments with performance-enhancing features. The coating helps resist corrosion and extends rotor life, while the dimpled and slotted design improves braking response and pad cleaning. This product line is tailored for drivers seeking reliable braking components that maintain performance under varied driving conditions.

Common Applications and Problem Solving

• Replacement for worn or warped rotors on compatible BMW models
• Improves braking performance in wet or dusty conditions
• Reduces brake fade during extended or aggressive driving
• Helps eliminate brake noise and vibration caused by uneven rotor surfaces
• Prevents rust and corrosion buildup on rotor surfaces

Installation Notes and Tips

• Ensure rotor thickness is above discard thickness (28.4 mm) before installation
• Clean rotor surface and hub mounting area to prevent uneven contact
• Torque bolts to manufacturer specifications for secure fitment
• Inspect brake pads for wear and replace if necessary when installing new rotors
• Perform a proper bed-in procedure after installation to optimize braking performance

Quality Assurance and Warranty

Dynamite Friction manufactures the 644-31112 rotor to meet OEM standards for fit, form, and function. The vented rotor design and coating process undergo quality control to ensure durability and consistent braking performance. Warranty details should be confirmed with the distributor or manufacturer, as coverage may vary.