Dynamite Friction 631-31089R Disc Brake Rotor - Front Right

Overview of Dynamite Friction DFC Brake Rotor

The Dynamite Friction DFC Brake Rotor - Drilled and Slotted - Silver (part number 631-31089R) is engineered for BMW models including the 220i, 328i xDrive, 330i, and X1. This vented disc brake rotor features a directional, slotted and drilled surface designed to enhance braking performance and heat dissipation.

• Nominal thickness: 23.8 mm with a discard thickness of 22.4 mm
• Vented rotor design for improved cooling
• Directional slotted and drilled surface for debris removal and consistent pad contact
• Zinc silver hat finish with rust-resistant coating for corrosion protection
• 5 bolt holes with 14.5 mm diameter and 120 mm bolt circle diameter
• Overall diameter of 312 mm and height of 73.6 mm
• Plain disc finish with a center hole diameter of 79 mm

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 on the braking surface. This design improves water and gas evacuation during braking, reducing brake fade and maintaining consistent stopping power. The silver zinc coating on the rotor hat enhances corrosion resistance, extending rotor life especially in wet or humid conditions. This product line is tailored for drivers seeking reliable performance on BMW vehicles requiring vented, directional rotors.

Technical Description and Specifications

This disc brake rotor is vented to allow air flow between the rotor surfaces, which helps dissipate heat generated during braking. The directional slotted and drilled surface improves pad bite and helps channel away brake dust and moisture. The rotor’s nominal thickness is 23.8 mm, with a discard thickness of 22.4 mm, ensuring safe replacement intervals. The rotor features a zinc silver hat finish with a rust-resistant coating to protect against corrosion. It has five bolt holes with a diameter of 14.5 mm arranged on a 120 mm bolt circle diameter, compatible with various BMW models such as the 220i, 230i xDrive, 328d, 330i GT xDrive, and X1.

Compatible Vehicles and Common Applications

• Replacement rotor for BMW 220i, 228i, 230i, 320i, 323i, 325i, 328d, 328i, 330i, 428i, 430i, and X1 models
• Addresses issues like brake fade under heavy use
• Improves heat dissipation for consistent braking performance
• Reduces brake dust accumulation on rotor surface
• Helps prevent corrosion-related rotor damage

Installation Notes and Tips

Ensure the rotor thickness is above the discard thickness of 22.4 mm before installation. Clean the rotor surface to remove any protective coating or debris prior to mounting. Verify bolt hole alignment with the 120 mm bolt circle diameter and 14.5 mm bolt hole diameter for proper fitment. Use proper torque specifications for the 5 lug bolts to avoid warping. Directional rotors must be installed with the correct rotation direction to maintain performance benefits.

Quality Assurance and Warranty

Dynamite Friction manufactures this rotor to meet OEM specifications for fit and function on compatible BMW models. The rust-resistant zinc silver coating helps extend rotor life in corrosive environments. While specific warranty details are not provided, Dynamite Friction products typically adhere to industry standards for durability and performance.