Dynamite Friction 631-31106L Disc Brake Rotor - Rear Left

Overview of Dynamite Friction DFC Brake Rotor

The Dynamite Friction DFC Brake Rotor - Drilled and Slotted - Silver (part number 631-31106L) is engineered for BMW models including the 535i, 550i, 640i, 650i, and 7 Series variants. This vented disc brake rotor features a directional, slotted and drilled surface designed to enhance braking performance and heat dissipation.

• Compatible with BMW 535i, 535i GT, 550i, 640i, 650i, 740i, and ActiveHybrid 7 models
• Part Number: 631-31106L
• Vented disc brake rotor with drilled and slotted surface
• Nominal thickness: 23.8 mm; discard thickness: 22.4 mm
• Outside diameter: 345 mm; overall height: 69.1 mm
• Directional brake surface with zinc silver hat finish and rust-resistant coating
• 5 bolt holes with 16.6 mm diameter and 120 mm bolt circle diameter

Product Line Details: DFC Brake Rotor - Drilled and Slotted - Silver

The DFC Brake Rotor - Drilled and Slotted - Silver line by 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 precise fitment and consistent braking response.

Technical Specifications and Features

This disc brake rotor is vented to allow better airflow and heat dissipation during braking, which helps prevent warping and extends rotor life. The rotor’s nominal thickness is 23.8 mm, with a discard thickness of 22.4 mm, ensuring safe replacement intervals. The rotor measures 345 mm in outside diameter and 69.1 mm in overall height, matching OEM specifications for proper fitment. The directional slotted and drilled surface enhances braking by improving pad bite and reducing gas buildup. The zinc silver hat finish and rust-resistant coating protect against corrosion, maintaining rotor integrity over time. The rotor features 5 bolt holes with a diameter of 16.6 mm and a bolt circle diameter of 120 mm, compatible with specified BMW models.

Applications and Problem Solving

• Replacement for worn or warped rotors on BMW 535i, 550i, 640i, 650i, and 7 Series vehicles
• Improves braking performance under high heat conditions
• Reduces brake fade caused by gas and debris buildup
• Prevents rust and corrosion on rotor surfaces
• Ensures proper fitment and alignment with OEM bolt pattern and dimensions

Installation Notes and Tips

Ensure the rotor thickness is above the discard thickness of 22.4 mm before installation. Clean the rotor surface to remove any protective coatings or contaminants prior to mounting. Verify bolt hole alignment with the vehicle’s hub using the 5-bolt, 120 mm bolt circle pattern. Use proper torque specifications for lug nuts to avoid rotor warping. It is recommended to replace brake pads simultaneously to ensure optimal braking performance.

Quality Assurance

Dynamite Friction rotors are manufactured to meet or exceed OEM standards for fit, form, and function. The rust-resistant coating and zinc silver hat finish provide added durability against environmental factors. While specific warranty details are not provided, Dynamite Friction products are designed for consistent performance and reliability in BMW brake systems.