Dynamite Friction 830-31027L Disc Brake Rotor - Front Left

Overview of Dynamite Friction DFC Geoperformance Rotor

The Dynamite Friction DFC Geoperformance Rotor - Drilled and Slotted (part number 830-31027L) is engineered for BMW models including the 318i, 320i, 323i, 325i, 328i, Z3, and Z4. This vented disc brake rotor features a directional, slotted and drilled surface designed to enhance braking performance and heat dissipation.

• Compatible with BMW 318i, 318is, 318ti, 320i, 323Ci, 323i, 323is, 325i, 325is, 328i, 328is, Z3, and Z4 models
• Directional slotted and drilled surface for improved brake pad bite and cooling
• Vented rotor design with 286 mm outside diameter and 51.7 mm overall height
• Rust resistant coating with Geospec silver grey hat finish for corrosion protection
• Nominal thickness of 22 mm and discard thickness of 20.4 mm for durability
• Five bolt holes with 15 mm diameter and 120 mm bolt circle diameter

Detailed Product Features and Specifications

This Dynamite Friction rotor is part of the DFC Geoperformance Rotor - Drilled and Slotted line, which focuses on delivering enhanced braking efficiency through advanced rotor surface design. The drilled and slotted surface helps to evacuate gases, dust, and water, reducing brake fade and maintaining consistent stopping power. The vented rotor construction improves heat dissipation during heavy braking, which is critical for maintaining rotor integrity and brake pad life.

The rotor's nominal thickness is 22 mm, with a discard thickness of 20.4 mm, ensuring a long service life before replacement is necessary. The rotor features a plain disc finish combined with a Geospec silver grey hat finish that provides rust resistance, helping to maintain appearance and performance over time. The 5-lug bolt pattern with 15 mm diameter holes and a 120 mm bolt circle diameter matches the specified BMW models precisely.

Applications and Problem Solving

• Replaces worn or warped rotors on compatible BMW 3 Series and Z models
• Addresses brake fade caused by overheating during aggressive driving or towing
• Improves braking response in wet conditions by channeling water away from the rotor surface
• Reduces brake dust buildup for cleaner wheel appearance
• Helps maintain consistent brake pad contact and performance

Installation Notes and Tips

Ensure the rotor thickness is measured before installation to confirm it meets or exceeds the discard thickness of 20.4 mm. The directional slotted and drilled surface requires correct orientation during installation to optimize performance. Verify the 5-lug bolt pattern and 120 mm bolt circle diameter match your vehicle specifications. Clean the rotor surface of any protective coatings or oils before mounting brake pads to ensure proper bedding.

Quality Assurance and Warranty

Dynamite Friction manufactures the DFC Geoperformance Rotor - Drilled and Slotted to meet or exceed OEM specifications for fit, form, and function. The rust resistant coating and vented design contribute to long-term durability. Warranty details are provided by the manufacturer and should be confirmed at the time of purchase.