Dynamite Friction 631-31027L Disc Brake Rotor - Front Left

Overview of Dynamite Friction DFC Brake Rotor 631-31027L

The Dynamite Friction DFC Brake Rotor - Drilled and Slotted - Silver (part number 631-31027L) is engineered for precision braking performance on select BMW models. Designed with a vented, directional surface, this rotor enhances heat dissipation and braking consistency for vehicles like the BMW 318i, 325i, and Z4.

• Disc type: Vented disc brake rotor with drilled and slotted surface
• Nominal thickness: 22 mm with a discard thickness of 20.4 mm
• Overall diameter: 286 mm, height: 51.7 mm
• Bolt hole quantity: 5 with 15 mm diameter, bolt circle diameter: 120 mm
• Center hole diameter: 79 mm
• Rust resistant zinc silver hat finish and plain disc finish
• Directional brake surface optimized for improved water and debris clearance

Detailed Product Description

This DFC Brake Rotor - Drilled and Slotted - Silver from Dynamite Friction is designed specifically for BMW vehicles including the 318i, 318is, 320i, 323i, 325i, 328i, Z3, and Z4 models. The rotor features a vented design that promotes efficient heat dissipation during braking, reducing the risk of brake fade under demanding conditions. The drilled and slotted surface improves pad bite and helps channel away water, dust, and gases, maintaining consistent braking performance. The rotor’s zinc silver coated hat provides corrosion resistance, extending the rotor’s service life. With a nominal thickness of 22 mm and a discard thickness of 20.4 mm, this rotor meets OEM specifications for durability and safety.

DFC Brake Rotor - Drilled and Slotted - Silver Product Line

The DFC Brake Rotor - Drilled and Slotted - Silver line by Dynamite Friction focuses on rotors that combine drilled holes and slots with a corrosion-resistant finish. This product line is designed to enhance braking performance by improving heat dissipation and surface cleaning during braking events. The silver zinc coating on the rotor hat adds rust resistance, making it suitable for vehicles exposed to varying weather conditions. This rotor line is engineered to meet the demands of BMW drivers seeking reliable and consistent braking components.

Common Applications and Problem Solving

• Reduces brake fade caused by excessive heat buildup
• Improves braking performance in wet or dusty conditions
• Minimizes rotor surface glazing and pad deposits
• Prevents premature rust and corrosion on rotor hats
• Maintains consistent braking feel for BMW 318i, 325i, and Z4 models

Installation Notes and Tips

Ensure the rotor surface is clean and free of any protective coatings before installation. Verify the rotor thickness is above the discard thickness of 20.4 mm to maintain safety standards. Use proper torque specifications for the 5 lug bolts with 15 mm diameter holes and a 120 mm bolt circle diameter. Directional rotors must be installed with the correct rotation direction to optimize performance and longevity.

Quality Assurance

Dynamite Friction manufactures this rotor to meet or exceed OEM standards for fit, form, and function. The rust-resistant zinc silver finish on the rotor hat helps extend service life. While no specific warranty information is provided, the rotor is engineered for durability and consistent braking performance on compatible BMW models.