Dynamite Friction 631-31047R Disc Brake Rotor - Rear Right

Overview of Dynamite Friction DFC Brake Rotor

The Dynamite Friction DFC Brake Rotor - Drilled and Slotted - Silver (part number 631-31047R) 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: 631-31047R
• Vented disc brake rotor with drilled and slotted surface
• Nominal thickness: 19 mm; discard thickness: 17.4 mm
• Outside diameter: 294 mm; overall height: 59.7 mm
• 5 bolt holes with 14.6 mm diameter and 120 mm bolt circle diameter
• Zinc silver hat finish with rust-resistant coating
• Directional brake surface for optimized performance

Detailed Product Features and Specifications

This Dynamite Friction rotor is part of the DFC Brake Rotor - Drilled and Slotted - Silver line, which focuses on providing enhanced braking through improved heat dissipation and debris removal. The rotor’s vented design allows air to flow between the rotor surfaces, reducing heat buildup during braking. The drilled and slotted surface pattern helps to evacuate gases, dust, and water, maintaining consistent brake pad contact and reducing brake fade.

The rotor measures 294 mm in outside diameter with an overall height of 59.7 mm. It features a nominal thickness of 19 mm and a discard thickness of 17.4 mm, ensuring durability and safety over its service life. The zinc silver hat finish provides corrosion resistance, complemented by a rust-resistant coating on the rotor surface. The rotor includes five bolt holes with a diameter of 14.6 mm and a bolt circle diameter of 120 mm, matching the stud/lug hole pattern for precise fitment on compatible BMW models.

Applications and Problem Solving

• Replacement for worn or warped rotors on BMW 323i, 325Ci, 325i, 328Ci, and 328i
• Improves heat dissipation to reduce brake fade during aggressive driving or towing
• Slotted and drilled design helps maintain braking performance in wet or dusty conditions
• Addresses rotor surface corrosion with rust-resistant coating
• Restores braking smoothness and reduces vibration caused by rotor wear

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 coating or residue before mounting. Verify bolt hole alignment with the vehicle’s hub using the 5-bolt, 120 mm bolt circle pattern. Proper torque specifications should be followed to avoid rotor warping. It is recommended to inspect brake pads and hardware during rotor replacement for optimal braking system performance.

Quality Assurance and Warranty

Dynamite Friction manufactures the DFC Brake Rotor - Drilled and Slotted - Silver to meet or exceed OEM specifications for fit, form, and function. The rotor’s rust-resistant coating and zinc silver hat finish contribute to long-term durability. Warranty details are provided by the manufacturer and should be confirmed at the time of purchase.