Dynamite Friction 631-31117L Disc Brake Rotor - Rear Left

Overview of Dynamite Friction DFC Brake Rotor

The Dynamite Friction DFC Brake Rotor - Drilled and Slotted - Silver (part number 631-31117L) is engineered for BMW models including the 320i xDrive, 328i, 330i, 428i, and X1. This vented disc brake rotor features a directional, slotted and drilled surface designed to enhance braking performance and heat dissipation.

• Disc Type: Vented disc brake rotor with drilled and slotted surface
• Finish: Plain disc finish with zinc silver hat finish and rust-resistant coating
• Dimensions: 300 mm outside diameter, 66.3 mm overall height
• Thickness: Nominal thickness 20 mm, discard thickness 18.4 mm
• Bolt Pattern: 5 bolt holes with 16.8 mm diameter, 120 mm bolt circle diameter
• Center Hole Diameter: 75.05 mm
• Directional brake surface for optimized performance

Details on the DFC Brake Rotor - Drilled and Slotted - Silver Line

The DFC Brake Rotor - Drilled and Slotted - Silver line by Dynamite Friction focuses on rotors that combine drilled holes and slots to improve brake pad bite and reduce heat buildup. The zinc silver hat finish provides corrosion resistance, extending rotor life. This product line is designed to meet the demands of BMW vehicles requiring reliable vented rotors with enhanced cooling and rust protection.

Product Description and Specifications

This disc brake rotor is specifically designed for select BMW models such as the 320i xDrive, 328i xDrive, 330i GT xDrive, 428i Gran Coupe, and X1. The rotor’s vented design allows air to flow between the rotor surfaces, improving heat dissipation during braking. The drilled and slotted surface helps to evacuate gases and debris, maintaining consistent brake pad contact and reducing brake fade. The rotor features a plain disc finish paired with a zinc silver hat finish that includes a rust-resistant coating to protect against corrosion. With a nominal thickness of 20 mm and a discard thickness of 18.4 mm, this rotor meets OEM specifications for durability and performance. The 5-bolt hole pattern with a 120 mm bolt circle diameter ensures proper fitment on compatible BMW models.

Common Applications and Problem Solving

• Replacement for worn or warped rotors on BMW 320i xDrive and 328i models
• Improves braking performance on BMW 330i and 428i Gran Coupe vehicles
• Reduces brake fade caused by overheating during aggressive driving
• Prevents rust and corrosion on rotors exposed to moisture and road salt
• Restores proper brake rotor thickness and surface condition for safe stopping

Installation Notes and Tips

• Ensure rotor thickness is above discard thickness of 18.4 mm before installation
• Clean rotor surface and hub mounting area to prevent uneven wear or vibration
• Torque lug nuts to manufacturer specifications for BMW 5-lug bolt pattern (120 mm bolt circle)
• Check compatibility with specific BMW model and year before installation
• Replace brake pads when installing new rotors for optimal braking performance

Quality Assurance and Warranty

Dynamite Friction manufactures the 631-31117L rotor to meet or exceed OEM standards for fit, form, and function. The rust-resistant coating and zinc silver hat finish contribute to long-term durability. While specific warranty details are not provided, Dynamite Friction products typically come with a limited warranty against manufacturing defects. Always verify warranty terms with the product documentation or supplier.