Dynamite Friction 631-31109L Disc Brake Rotor - Rear Left

Overview of DFC Brake Rotor - Drilled and Slotted - Silver

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

• Disc type: Vented disc brake rotor with drilled and slotted surface
• Nominal thickness: 20 mm; discard thickness: 18.4 mm
• Outside diameter: 330 mm; overall height: 66.4 mm
• Hat finish: Zinc silver with rust-resistant coating
• Bolt hole quantity: 5; bolt hole diameter: 16.8 mm; bolt circle diameter: 120 mm
• Directional brake surface for optimized braking efficiency
• Center hole diameter: 75 mm; stud/lug hole diameter: 16.8 mm; stud/lug hole quantity: 5

Product Line Details

The DFC Brake Rotor - Drilled and Slotted - Silver line from Dynamite Friction is designed to provide reliable braking performance with enhanced heat dissipation and reduced brake fade. The drilled and slotted surface improves water and debris evacuation, while the vented rotor design helps maintain optimal operating temperatures. The zinc silver hat finish and rust-resistant coating contribute to durability and corrosion resistance, making this rotor suitable for BMW vehicles requiring consistent braking under varied driving conditions.

Technical Description and Features

This disc brake rotor is engineered with a 330 mm outside diameter and a nominal thickness of 20 mm, ensuring compatibility with specified BMW models. The vented rotor design allows air to flow between the rotor surfaces, reducing heat buildup during braking. The drilled and slotted surface pattern is directional, which aids in channeling gases, dust, and water away from the braking surface to maintain consistent pad contact and braking efficiency. The zinc silver hat finish with rust-resistant coating protects against corrosion, extending the rotor's service life.

Applications and Problem Solving

• Reduces brake fade caused by excessive heat buildup during aggressive or prolonged braking
• Improves wet weather braking performance by evacuating water from the rotor surface
• Minimizes brake dust accumulation for cleaner braking components
• Restores braking performance on BMW 3 Series and 4 Series models with worn or damaged rotors
• Provides a direct replacement rotor for vehicles requiring vented, drilled, and slotted rotors

Installation Notes and Tips

• Ensure rotor thickness is above discard thickness of 18.4 mm before installation
• Clean rotor surface and hub mounting area to prevent uneven rotor seating
• Torque lug nuts to manufacturer specifications to avoid rotor warping
• Inspect brake pads and replace if worn to ensure optimal rotor performance
• Perform a bed-in procedure after installation to maximize braking efficiency

Quality Assurance and Warranty

Dynamite Friction manufactures the 631-31109L rotor to meet or exceed OEM specifications for fitment and performance on compatible BMW models. The rotor includes a rust-resistant coating to enhance durability. Please refer to Dynamite Friction's warranty policy for specific coverage details.