Dynamite Friction 631-31066L Disc Brake Rotor - Rear Left

Overview of Dynamite Friction DFC Brake Rotor

The Dynamite Friction DFC Brake Rotor - Drilled and Slotted - Silver (part number 631-31066L) is engineered for BMW 525i, 528i, and 530i models. This vented disc brake rotor features a directional, slotted and drilled surface designed to enhance braking performance and heat dissipation.

• Compatible with BMW 525i, 528i, and 530i
• Part Number: 631-31066L
• Vented disc brake rotor with drilled and slotted surface
• Nominal thickness: 20 mm; discard thickness: 18.4 mm
• Overall diameter: 320 mm; height: 63.1 mm
• Rust resistant zinc silver hat finish
• 5 bolt holes with 14.7 mm diameter and 120 mm bolt circle diameter
• Directional brake surface for optimized performance

Product Line Details: DFC Brake Rotor - Drilled and Slotted - Silver

The DFC Brake Rotor - Drilled and Slotted - Silver line by Dynamite Friction offers rotors with enhanced surface features including drilled holes and slots. These design elements improve heat dissipation and help reduce brake fade under demanding conditions. The zinc silver hat finish provides corrosion resistance, extending rotor life. This product line is tailored for drivers seeking reliable braking performance with a focus on durability and consistent stopping power.

Technical Specifications and Features

This disc brake rotor is vented to allow better airflow and heat management during braking. The rotor’s nominal thickness is 20 mm, with a discard thickness of 18.4 mm, ensuring safe replacement intervals. The rotor measures 320 mm in outside diameter and 63.1 mm in overall height, fitting precisely on compatible BMW models. The rotor surface is both drilled and slotted, which aids in removing brake dust and gases, improving pad contact and braking efficiency. The hat section features a rust-resistant zinc silver coating to protect against corrosion. The rotor includes five bolt holes with a diameter of 14.7 mm arranged on a 120 mm bolt circle diameter, matching the stud/lug hole pattern of the specified BMW vehicles.

Applications and Problem Solving

• Replacement rotor for worn or warped brake rotors on BMW 525i, 528i, and 530i
• Improves heat dissipation to reduce brake fade during aggressive driving or heavy braking
• Helps maintain consistent braking performance by reducing pad glazing and brake dust buildup
• Corrosion resistance extends rotor lifespan in humid or salty environments
• Directional design supports optimal braking efficiency and rotor longevity

Installation Notes and Tips

Ensure the rotor thickness is above the discard thickness of 18.4 mm before installation. Clean the rotor surface to remove any protective coatings or oils prior to mounting. Verify bolt hole alignment with the 5-lug, 120 mm bolt circle pattern on your BMW 525i, 528i, or 530i. Use proper torque specifications for lug nuts to avoid rotor warping. It is recommended to replace brake pads when installing new rotors to ensure optimal braking performance.

Quality Assurance

Dynamite Friction manufactures the 631-31066L rotor to meet or exceed OEM specifications for fitment and performance on BMW 525i, 528i, and 530i models. The rust-resistant zinc silver finish helps protect against corrosion, contributing to longer service life. While no specific warranty information is provided, this rotor is designed for durability and consistent braking under normal operating conditions.