Dynamite Friction 631-31070L Disc Brake Rotor - Rear Left

Overview of Dynamite Friction DFC Brake Rotor

The Dynamite Friction DFC Brake Rotor - Drilled and Slotted - Silver (part number 631-31070L) is engineered for BMW models including the 325i, 330i, 330xi, 335d, 335i, 335is, 335i xDrive, 335xi, and X1. This vented disc brake rotor features a directional, slotted and drilled surface designed to enhance braking performance and heat dissipation.

• Nominal thickness: 22 mm with a discard thickness of 20.4 mm
• Vented rotor design for improved cooling
• Directional slotted and drilled surface for debris removal and heat management
• Plain disc finish with zinc silver hat finish for corrosion resistance
• Rust resistant coating applied for extended durability
• Five bolt holes with 14.8 mm diameter and 120 mm bolt circle diameter
• Overall diameter of 336 mm and height of 67.2 mm
• Center hole diameter of 75 mm for precise fitment

Details on the DFC Brake Rotor - Drilled and Slotted - Silver Line

The DFC Brake Rotor - Drilled and Slotted - Silver line by Dynamite Friction focuses on rotors that combine drilled holes and slots to improve brake pad bite and reduce heat buildup. The silver zinc coating on the rotor hat enhances corrosion resistance, making it suitable for various driving conditions. This product line is designed to meet the specific requirements of BMW vehicles, ensuring compatibility and reliable braking performance.

Product Specifications and Features

This disc brake rotor is vented, allowing air to flow between the rotor surfaces to dissipate heat more effectively during braking. The directional slotted and drilled surface helps channel away water, dust, and gases, which can improve braking consistency and reduce brake fade. The rotor’s nominal thickness is 22 mm, with a discard thickness of 20.4 mm, indicating when replacement is necessary to maintain safety and performance. The zinc silver finish on the rotor hat provides rust resistance, extending the rotor’s service life.

Applications and Problem Solving

• Compatible with BMW 325i, 330i, 330xi, 335d, 335i, 335is, 335i xDrive, 335xi, and X1 models
• Addresses brake fade caused by excessive heat during aggressive driving or towing
• Reduces brake dust accumulation on rotor surface for cleaner braking
• Improves wet weather braking performance by channeling water away
• Helps prevent rotor warping through enhanced heat dissipation

Installation Notes and Tips

Ensure the rotor is installed with the directional surface oriented correctly according to the vehicle’s rotation direction. Verify bolt hole alignment with the 5-lug, 120 mm bolt circle pattern. Check rotor thickness before installation to confirm it meets or exceeds the nominal thickness of 22 mm. Use proper torque specifications for lug nuts to avoid rotor damage or uneven wear.

Quality Assurance

Dynamite Friction rotors are manufactured to meet OEM specifications for fit and function. The rust resistant coating and zinc silver hat finish contribute to long-term durability. While no specific warranty information is provided, adherence to discard thickness guidelines ensures safe operation and rotor longevity.