Dynamite Friction 631-31090R Disc Brake Rotor - Rear Right

Overview of Dynamite Friction DFC Brake Rotor

The Dynamite Friction DFC Brake Rotor - Drilled and Slotted - Silver (part number 631-31090R) is engineered for BMW 135i and 135is models. This vented disc brake rotor features a directional, slotted, and drilled surface designed to enhance braking performance and heat dissipation.

• Compatible with BMW 135i and 135is models
• Directional slotted and drilled surface for improved brake pad contact and cooling
• Vented rotor design to reduce heat buildup
• Rust-resistant zinc silver hat finish for corrosion protection
• Nominal thickness of 21.8 mm with discard thickness at 20.4 mm
• 5 bolt holes with 14.7 mm diameter and 120 mm bolt circle diameter
• Overall diameter of 324 mm and height of 77.5 mm

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

The DFC Brake Rotor - Drilled and Slotted - Silver line by Dynamite Friction focuses on rotors that combine drilled holes and precision slots on the braking surface. This design aids in gas and dust evacuation while maintaining consistent pad contact. The zinc silver coating on the rotor hat provides additional rust resistance, extending rotor life in various driving conditions. This product line is tailored for drivers seeking reliable braking components compatible with specific BMW models.

Technical Specifications and Features

This disc brake rotor is vented to allow airflow between the rotor surfaces, which helps dissipate heat generated during braking. The rotor's surface is both drilled and slotted, enhancing water and debris removal from the braking surface and improving overall braking consistency. The rotor has a nominal thickness of 21.8 mm and a discard thickness of 20.4 mm, ensuring safe replacement intervals. The zinc silver finish on the rotor hat offers corrosion resistance, which is critical for maintaining structural integrity over time. The rotor features five bolt holes with a diameter of 14.7 mm and a bolt circle diameter of 120 mm, matching the BMW 135i and 135is wheel hub specifications.

Applications and Problem Solving

• Replaces worn or warped rotors on BMW 135i and 135is models
• Improves heat dissipation to reduce brake fade during aggressive driving
• Enhances braking performance in wet conditions by evacuating water from the rotor surface
• Reduces brake dust buildup for cleaner braking components
• Prevents rust and corrosion on rotor hats to extend service life

Installation Notes and Tips

Ensure the rotor thickness is above the discard thickness of 20.4 mm before installation. Clean the rotor surface to remove any protective coatings or residues before mounting. Verify bolt hole alignment with the 5-lug, 120 mm bolt circle pattern on BMW 135i and 135is hubs. Use proper torque specifications for lug nuts to avoid rotor warping. It is recommended to replace brake pads simultaneously to ensure optimal braking performance.

Quality Assurance

Dynamite Friction manufactures the 631-31090R rotor to meet OEM specifications for fitment and performance on BMW 135i and 135is vehicles. The rust-resistant zinc silver coating and vented rotor design contribute to durability and consistent braking. While no specific warranty information is provided, this rotor is produced under strict quality control standards to ensure reliability and safety.