Dynamite Friction 640-31114 Disc Brake Rotor - Rear

Overview of Dynamite Friction DFC Brake Rotor

The Dynamite Friction DFC Brake Rotor - Dimpled and Slotted (part number 640-31114) is engineered for precision braking performance on select BMW models. Designed as a vented disc brake rotor, it offers enhanced heat dissipation and consistent stopping power for vehicles such as the BMW 330i xDrive and 440i Gran Coupe.

• Vented rotor design for improved cooling
• Dimpled and slotted surface to reduce brake fade
• Nominal thickness of 24 mm with discard thickness at 22.4 mm
• Outside diameter of 345 mm and inside diameter of 75 mm
• Five bolt holes with 16.6 mm diameter for secure fitment
• Height of 66.2 mm ensuring proper alignment and clearance

Detailed Product Description

This DFC Brake Rotor - Dimpled and Slotted from Dynamite Friction is specifically designed to meet the braking demands of various BMW models including the 230i, 335i xDrive, and M240i xDrive. The vented rotor construction allows air to flow between the rotor surfaces, effectively dissipating heat generated during braking. The dimpled and slotted pattern helps to evacuate gases, dust, and water, maintaining consistent brake pad contact and reducing the risk of brake fade under heavy use.

With a nominal thickness of 24 mm and a discard thickness of 22.4 mm, this rotor provides a balance between durability and performance. The 345 mm outside diameter and 75 mm inside diameter are engineered to fit the specified BMW models precisely, while the five bolt holes with a 16.6 mm diameter ensure secure mounting. The rotor height of 66.2 mm is designed to maintain proper clearance within the brake assembly.

Compatible BMW Models and Applications

• BMW 230i and 230i xDrive
• BMW 328i and 330i xDrive
• BMW 335i and 335i xDrive
• BMW 340i and 340i xDrive
• BMW 428i, 428i Gran Coupe, and 428i xDrive
• BMW 430i and 430i xDrive
• BMW 435i, 435i Gran Coupe, 435i xDrive, and 435i xDrive Gran Coupe
• BMW 440i, 440i Gran Coupe, 440i xDrive, and 440i xDrive Gran Coupe
• BMW ActiveHybrid 3
• BMW M240i and M240i xDrive

Common Issues Addressed by This Rotor

• Brake fade caused by excessive heat buildup
• Uneven brake pad wear due to rotor surface irregularities
• Reduced braking efficiency in wet conditions
• Vibration or pulsation during braking from warped rotors
• Premature rotor wear from inadequate cooling

Installation Notes and Tips

• Ensure rotor thickness is above discard thickness (22.4 mm) before installation
• Clean rotor surface to remove any protective coatings or debris
• Torque lug bolts to manufacturer specifications for BMW models
• Inspect brake pads and calipers for wear or damage during installation
• Perform a proper bed-in procedure after installation for optimal performance

Quality Assurance and Warranty

Dynamite Friction manufactures the DFC Brake Rotor - Dimpled and Slotted to meet OEM standards for fit and function on compatible BMW vehicles. The vented rotor design and precise machining contribute to consistent braking performance and durability. Please refer to Dynamite Friction's warranty policy for specific coverage details related to this part number 640-31114.