Dynamite Friction 631-31075L Disc Brake Rotor - Rear Left

Overview of Dynamite Friction DFC Brake Rotor

The Dynamite Friction DFC Brake Rotor - Drilled and Slotted - Silver (part number 631-31075L) is engineered for BMW models including the 525xi, 528i xDrive, 528xi, 530xi, and 535i xDrive. This vented disc brake rotor features a directional, slotted and drilled surface designed to enhance braking performance and heat dissipation.

• Compatible with BMW 525xi, 528i xDrive, 528xi, 530xi, and 535i xDrive
• Part number 631-31075L for precise identification
• Vented rotor design for improved cooling
• Directional slotted and drilled surface for enhanced brake pad bite and debris removal
• Rust resistant zinc silver hat finish and plain disc finish
• 5 bolt holes with 14.8 mm diameter and 120 mm bolt circle diameter
• Nominal thickness of 19.9 mm and discard thickness of 18.4 mm
• Overall height and rotor height of 86.1 mm
• Outside diameter of 320 mm for exact 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 on the braking surface. This design improves water and gas evacuation during braking, reducing brake fade and maintaining consistent performance. The silver zinc coating on the rotor hat provides corrosion resistance, extending the rotor's service life. This product line is tailored for drivers seeking reliable, vented rotors with directional braking surfaces for specific BMW applications.

Technical Specifications and Features

This disc brake rotor is vented to allow air circulation between the rotor faces, which helps dissipate heat generated during braking. The rotor's directional surface features both drilled holes and slots, which aid in removing brake dust, gases, and moisture from the pad contact area. The rotor has a nominal thickness of 19.9 mm and a discard thickness of 18.4 mm, ensuring safe replacement intervals. The zinc silver hat finish offers rust resistance, while the plain disc finish maintains a clean braking surface. The rotor includes five bolt holes with a diameter of 14.8 mm and a bolt circle diameter of 120 mm, matching the stud/lug hole pattern of the compatible BMW models.

Applications and Problem Solving

• Reduces brake fade during aggressive or prolonged braking
• Improves braking response in wet conditions by evacuating water
• Minimizes brake dust buildup on rotor surface
• Prevents rust and corrosion on the rotor hat for longer durability
• Ensures proper fitment and performance on BMW 525xi, 528i xDrive, 528xi, 530xi, and 535i xDrive models

Installation Notes and Tips

Ensure the rotor thickness is above the discard thickness of 18.4 mm before installation. Clean the rotor surface to remove any protective coating or residue prior to mounting. Verify the bolt hole pattern and diameter (5 holes, 14.8 mm diameter, 120 mm bolt circle) matches your vehicle’s hub. Use proper torque specifications for lug nuts to avoid rotor warping. Directional rotors must be installed with the correct rotation direction as indicated by the rotor design.

Quality Assurance and Warranty

Dynamite Friction manufactures this rotor to meet OEM specifications for fit and function on specified BMW models. The rust resistant coating and vented design contribute to the rotor’s durability and consistent braking performance. Warranty details are subject to the manufacturer’s terms and should be confirmed at the time of purchase.