Dynamite Friction 633-31047L Disc Brake Rotor - Rear Left

Overview of Dynamite Friction DFC Brake Rotor

The Dynamite Friction DFC Brake Rotor - Drilled and Slotted - Black (part number 633-31047L) is engineered for BMW 323i, 325Ci, 325i, 328Ci, 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 323i, 325Ci, 325i, 328Ci, and 328i
• Part number 633-31047L
• Vented disc brake rotor with directional drilled and slotted surface
• Overall diameter: 294 mm; nominal thickness: 19 mm; discard thickness: 17.4 mm
• Hat finish in zinc black with rust-resistant coating
• 5 bolt holes with 14.6 mm diameter and 120 mm bolt circle diameter
• Center hole diameter: 75 mm; overall height: 59.7 mm

DFC Brake Rotor - Drilled and Slotted - Black Product Line

The DFC Brake Rotor - Drilled and Slotted - Black line by Dynamite Friction focuses on rotors that combine drilled holes and slots on a vented disc design. This configuration improves heat dissipation and helps reduce brake fade under demanding conditions. The zinc black hat finish and rust-resistant coating provide added durability against corrosion, making these rotors suitable for daily driving and spirited use on compatible BMW models.

Technical Specifications and Features

This disc brake rotor is vented to allow better airflow and cooling during braking. The directional surface features both drilled holes and slots, which aid in removing brake dust, gases, and water from the rotor surface. The rotor’s nominal thickness is 19 mm, with a discard thickness of 17.4 mm, ensuring a clear service limit for safe operation. The rotor measures 294 mm in outside diameter and 59.7 mm in overall height, fitting precisely on BMW 323i, 325Ci, 325i, 328Ci, and 328i models. The 5-bolt hole pattern with a 120 mm bolt circle diameter and 14.6 mm bolt hole diameter matches factory specifications for secure mounting.

Common Applications and Problem Solving

• Replacement for worn or warped rotors on BMW 3 Series models 323i, 325Ci, 325i, 328Ci, and 328i
• Improves heat dissipation to reduce brake fade during aggressive driving
• Helps eliminate brake judder caused by uneven rotor surfaces
• Rust-resistant coating protects against corrosion in humid or wet environments
• Directional drilled and slotted design assists in maintaining consistent braking performance in wet conditions

Installation Notes and Tips

Ensure the rotor is installed with the directional surface facing the correct rotation direction as indicated by the arrow on the rotor. Verify that the bolt hole pattern and center hole diameter match the vehicle hub specifications. It is recommended to replace brake pads when installing new rotors to maintain optimal braking performance. Check rotor thickness before installation to confirm it meets or exceeds the nominal thickness of 19 mm and is above the discard thickness of 17.4 mm.

Quality Assurance and Warranty

Dynamite Friction manufactures the 633-31047L rotor to meet OEM standards for fit, form, and function. The rust-resistant coating and zinc black hat finish contribute to the rotor’s durability. While specific warranty details are not provided, Dynamite Friction products typically adhere to industry quality controls to ensure reliable braking performance on compatible BMW models.