Dynamite Friction 633-31067L Disc Brake Rotor - Front Left

Overview of Dynamite Friction DFC Brake Rotor

The Dynamite Friction DFC Brake Rotor - Drilled and Slotted - Black (part number 633-31067L) is engineered for reliable 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 120i, 125i, 128i, 323i, 325i, 325xi, 328i, and 328xi.

• Part Number: 633-31067L
• Compatible with BMW 120i, 125i, 128i, 323i, 325i, 325xi, 328i, 328xi
• Disc Diameter: 300 mm
• Nominal Thickness: 24 mm; Discard Thickness: 22.4 mm
• Vented, drilled and slotted directional surface
• Hat finish with zinc black rust-resistant coating
• 5 bolt holes with 14.7 mm diameter and 120 mm bolt circle diameter
• Center hole diameter: 79 mm
• Overall height: 73.8 mm

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

The DFC Brake Rotor - Drilled and Slotted - Black line by Dynamite Friction focuses on rotors that combine drilled and slotted surfaces with a vented design to improve heat dissipation and reduce brake fade. The black zinc coating on the hat provides corrosion resistance, extending rotor life. This product line is tailored for drivers seeking enhanced braking performance and durability on compatible BMW vehicles.

Technical Description and Specifications

This disc brake rotor features a 300 mm outside diameter and a nominal thickness of 24 mm, with a discard thickness of 22.4 mm to ensure safe replacement intervals. The rotor is vented to allow better airflow and heat management during braking. Its surface is both drilled and slotted in a directional pattern, which helps evacuate gases, dust, and water, improving braking response and consistency. The rotor’s hat is finished with a zinc black coating to resist rust and corrosion, maintaining structural integrity over time. It includes five bolt holes with a diameter of 14.7 mm arranged on a 120 mm bolt circle diameter, matching the stud/lug hole pattern for precise fitment on specified BMW models.

Applications and Problem Solving

• Reduces brake fade during aggressive or repeated braking
• Improves heat dissipation to prevent rotor warping
• Enhances braking performance in wet conditions by channeling water away
• Minimizes brake dust buildup for cleaner rotor surface
• Provides corrosion resistance to extend rotor lifespan

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 residues prior to mounting. Verify bolt hole alignment with the vehicle’s hub using the 120 mm bolt circle diameter and 14.7 mm bolt hole diameter. Proper torque specifications should be followed to avoid rotor distortion. This rotor is directional; install with the correct orientation to maintain optimal performance.

Quality Assurance

Dynamite Friction manufactures the 633-31067L rotor to meet OEM standards for fit and function on compatible BMW models. The rust-resistant zinc black coating and vented design contribute to durability and consistent braking performance. Warranty information is available through Dynamite Friction and should be confirmed at the time of purchase.