Dynamite Friction 633-31042L Disc Brake Rotor - Rear Left

Overview of Dynamite Friction DFC Brake Rotor

The Dynamite Friction DFC Brake Rotor - Drilled and Slotted - Black (part number 633-31042L) is engineered for BMW 320i, 323Ci, 323i, and 328i models. This vented disc brake rotor features a directional, slotted and drilled surface designed to enhance braking performance and heat dissipation.

• Compatible with BMW 320i, 323Ci, 323i, and 328i
• Part number 633-31042L
• Vented disc brake rotor with drilled and slotted surface
• Directional brake surface for optimized braking
• Zinc black hat finish with rust-resistant coating
• Nominal thickness: 19 mm; discard thickness: 17.4 mm
• 5 bolt holes with 14.6 mm diameter and 120 mm bolt circle diameter
• Overall diameter: 276 mm; height: 60 mm; center hole diameter: 75 mm

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

The DFC Brake Rotor - Drilled and Slotted - Black line by Dynamite Friction offers rotors designed with enhanced surface features to improve braking efficiency and rotor longevity. The drilled and slotted design helps to reduce brake fade by allowing gases and debris to escape, while the vented construction promotes better heat dissipation. The zinc black hat finish provides corrosion resistance, making these rotors suitable for daily driving conditions on compatible BMW models.

Technical Specifications and Features

This disc brake rotor is vented to improve airflow and cooling during braking, which helps maintain consistent performance under demanding conditions. The directional slotted and drilled surface is engineered to channel water, dust, and gases away from the braking surface, reducing the risk of brake fade and improving pad bite. The rotor measures 276 mm in outside diameter with a height of 60 mm and a center hole diameter of 75 mm, ensuring precise fitment on specified BMW vehicles. The rotor’s nominal thickness is 19 mm, with a discard thickness of 17.4 mm, indicating when replacement is necessary to maintain safety and performance.

Applications and Problem Solving

• Replacement rotor for worn or warped brake rotors on BMW 320i, 323Ci, 323i, and 328i
• Improves heat dissipation to reduce brake fade during aggressive or repeated braking
• Helps maintain consistent braking performance in wet or dusty conditions
• Addresses rotor corrosion issues with rust-resistant zinc black hat finish
• Enhances braking surface durability with vented and directional design

Installation Notes and Tips

Ensure the rotor thickness is above the discard thickness of 17.4 mm before installation. Clean the rotor surface to remove any protective coatings or residues prior to mounting. Verify bolt hole alignment with the 5-bolt pattern and 120 mm bolt circle diameter for proper fitment on BMW 320i, 323Ci, 323i, and 328i models. Use appropriate torque specifications for lug nuts to avoid rotor warping. It is recommended to replace brake pads simultaneously to ensure optimal braking performance.

Quality Assurance and Warranty

Dynamite Friction manufactures the 633-31042L rotor to meet or exceed OEM specifications for fit and function on compatible BMW models. The rust-resistant coating and zinc black hat finish contribute to extended rotor life. Please refer to Dynamite Friction’s warranty policy for specific coverage details.