Dynamite Friction 631-31109R Disc Brake Rotor - Rear Right

Overview of Dynamite Friction DFC Brake Rotor

The Dynamite Friction DFC Brake Rotor - Drilled and Slotted - Silver (part number 631-31109R) is engineered for BMW models including the 328i, 330i, 335i, 340i, 428i, 430i, 435i, 440i, and ActiveHybrid 3 variants. This vented disc brake rotor features a directional, slotted and drilled surface designed to enhance braking performance and heat dissipation.

• Compatible with multiple BMW models such as 328i xDrive, 335i GT xDrive, 430i Gran Coupe, and 440i xDrive Gran Coupe
• Vented rotor design with drilled and slotted surface for improved cooling and debris removal
• Nominal thickness of 20 mm and discard thickness of 18.4 mm for reliable wear limits
• Zinc silver hat finish with rust-resistant coating to reduce corrosion
• 5 bolt holes with 16.8 mm diameter and 120 mm bolt circle diameter for precise fitment
• Overall diameter of 330 mm and height of 66.4 mm for exact OEM replacement

Detailed Product Description

The DFC Brake Rotor - Drilled and Slotted - Silver from Dynamite Friction is designed to meet the specific braking requirements of various BMW models. Its vented rotor construction allows for efficient heat dissipation during braking, reducing the risk of brake fade under demanding conditions. The rotor surface is both drilled and slotted, which helps to evacuate gases, dust, and water, maintaining consistent brake pad contact and improving overall stopping power.

Finished with a zinc silver coating on the hat and a rust-resistant layer on the rotor surface, this part offers enhanced durability against corrosion. The rotor’s directional design ensures optimal performance when installed correctly, and the precise bolt hole pattern (5 holes, 16.8 mm diameter, 120 mm bolt circle) guarantees a secure fit on compatible BMW models.

DFC Brake Rotor - Drilled and Slotted - Silver Product Line

The DFC Brake Rotor - Drilled and Slotted - Silver line by Dynamite Friction focuses on delivering rotors that combine functional design with corrosion resistance. This product line emphasizes vented rotors with directional, slotted, and drilled surfaces to improve braking efficiency and rotor longevity. The silver zinc finish on the hat and rust-resistant coating on the disc surface are standard features that help maintain rotor integrity over time.

Common Applications and Problem Solving

• Replacement for worn or warped rotors on BMW 328i, 335i, 430i, and 440i models
• Improves heat dissipation to reduce brake fade during aggressive driving or towing
• Helps eliminate brake noise and vibration caused by uneven rotor surfaces
• Prevents rust and corrosion that can lead to premature rotor failure
• Maintains consistent braking performance in wet or dusty conditions

Installation Notes and Tips

• Ensure rotor is installed with the directional surface facing the correct rotation direction
• Check that the bolt hole pattern matches your vehicle’s hub (5 holes, 120 mm bolt circle)
• Measure rotor thickness before installation; replace if below discard thickness of 18.4 mm
• Use proper torque specifications for lug nuts to avoid rotor warping
• Inspect brake pads and calipers during installation for optimal braking system performance

Quality Assurance and Warranty

Dynamite Friction manufactures the 631-31109R rotor to meet or exceed OEM specifications for fit, form, and function. The rust-resistant coating and zinc silver hat finish contribute to the rotor’s durability. While specific warranty details are not provided, Dynamite Friction products typically undergo rigorous quality control to ensure reliable performance on BMW vehicles including the 328i, 335i, and 440i series.