Dynamite Friction 631-31139R Disc Brake Rotor - Front Right

Overview of Dynamite Friction DFC Brake Rotor

The Dynamite Friction DFC Brake Rotor - Drilled and Slotted - Silver (part number 631-31139R) is engineered for BMW X3 models requiring reliable braking performance. This vented disc brake rotor features a directional, slotted and drilled surface designed to enhance heat dissipation and maintain consistent stopping power under demanding conditions.

• Compatible with BMW X3 vehicles
• Vented disc design for improved cooling
• Directional drilled and slotted surface for enhanced brake pad bite and debris removal
• Nominal thickness of 25 mm with a discard thickness of 23.4 mm
• Rust-resistant zinc silver hat finish for corrosion protection
• 5 bolt holes with 16.6 mm diameter and 120 mm bolt circle diameter
• Overall diameter of 325 mm and height of 62.3 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 performance. The silver zinc coating on the rotor hat provides additional rust resistance, extending the rotor's service life, especially in environments prone to corrosion.

Technical Specifications and Features

This disc brake rotor is vented, allowing air to flow between the rotor surfaces to dissipate heat more effectively during braking. The rotor's directional surface pattern, featuring both drilled holes and slots, is optimized for the BMW X3's braking system. The rotor measures 325 mm in outside diameter and 62.3 mm in height, with a center hole diameter of 75 mm. It includes five bolt holes, each 16.6 mm in diameter, arranged on a 120 mm bolt circle diameter, matching the BMW X3's hub specifications.

Applications and Problem Solving

• Replaces worn or warped rotors on BMW X3 models
• Improves brake cooling to reduce fade during heavy braking
• Enhances braking performance in wet conditions by evacuating water
• Reduces brake dust buildup with slotted surface design
• Prevents rust and corrosion on rotor hats for longer durability

Installation Notes and Tips

Ensure the rotor is compatible with your specific BMW X3 model year and brake system before installation. Clean the hub surface thoroughly to prevent rotor runout. Torque the bolts to manufacturer specifications using the 5-bolt pattern with 16.6 mm diameter holes on a 120 mm bolt circle. The directional rotor surface should be installed following the indicated rotation direction for optimal performance.

Quality Assurance and Warranty

Dynamite Friction manufactures this rotor with rust-resistant coatings and precise machining to meet OEM fitment standards. While specific warranty details are not provided, the rotor is designed to maintain structural integrity and braking performance under normal operating conditions for BMW X3 vehicles.