Dynamite Friction 631-31097L Disc Brake Rotor - Front Left

Overview of Dynamite Friction DFC Brake Rotor

The Dynamite Friction DFC Brake Rotor - Drilled and Slotted - Silver (part number 631-31097L) is engineered for BMW models including the 535d, 535d xDrive, 535i, 535i xDrive, 640i, 640i Gran Coupe, 640i xDrive, 640i xDrive Gran Coupe, and ActiveHybrid 5. This vented disc brake rotor features a directional, slotted and drilled surface designed to enhance braking performance and heat dissipation.

• Nominal thickness: 30 mm with a discard thickness of 28.4 mm
• Vented rotor design for improved cooling
• Directional slotted and drilled surface for debris removal and consistent pad contact
• Rust-resistant zinc silver hat finish and plain disc finish
• 5 bolt holes with 16.6 mm diameter and 120 mm bolt circle diameter
• Overall diameter of 348 mm and height of 66.5 mm
• Center hole diameter of 75 mm for precise fitment

Detailed Product Description

This DFC Brake Rotor - Drilled and Slotted - Silver from Dynamite Friction is designed to meet the specific braking requirements of select BMW vehicles. The rotor’s vented construction allows for efficient heat dissipation during braking, reducing the risk of brake fade under demanding conditions. The directional slotted and drilled surface improves water and gas evacuation, maintaining consistent braking performance. The zinc silver coating on the rotor hat provides corrosion resistance, extending the rotor’s service life. With a nominal thickness of 30 mm and a discard thickness of 28.4 mm, this rotor ensures durability and safety throughout its lifespan.

DFC Brake Rotor Product Line Features

The DFC Brake Rotor - Drilled and Slotted - Silver line by Dynamite Friction focuses on rotors that combine drilled holes and slots to optimize braking efficiency and rotor cooling. This product line is engineered to provide reliable performance for vehicles requiring vented rotors with directional surfaces, such as the BMW 535i and 640i series. The silver zinc coating enhances rust resistance, making these rotors suitable for various driving conditions.

Applications and Problem Solving

• Compatible with BMW 535d, 535d xDrive, 535i, 535i xDrive, 640i, 640i Gran Coupe, 640i xDrive, 640i xDrive Gran Coupe, and ActiveHybrid 5 models
• Addresses brake fade caused by excessive heat buildup
• Reduces brake dust and debris accumulation on rotor surface
• Improves wet weather braking performance by evacuating water
• Minimizes rotor warping through enhanced cooling

Installation Notes and Tips

Ensure the rotor surface is clean and free of contaminants before installation. Verify the bolt hole pattern matches the vehicle’s hub (5 holes, 16.6 mm diameter, 120 mm bolt circle diameter). Use proper torque specifications for lug nuts to avoid rotor damage. It is recommended to replace brake pads when installing new rotors to maintain optimal braking performance.

Quality Assurance

Dynamite Friction manufactures the 631-31097L rotor to meet or exceed OEM specifications for fit, form, and function. The rust-resistant zinc silver coating helps extend rotor life. While no specific warranty information is provided, Dynamite Friction products are subject to quality control standards to ensure reliable performance on BMW vehicles.