Dynamite Friction 631-74021R Disc Brake Rotor - Front Right

Overview of the DFC Brake Rotor - Drilled and Slotted - Silver

The Dynamite Friction DFC Brake Rotor - Drilled and Slotted - Silver (part number 631-74021R) is engineered for Audi and Volkswagen vehicles, including Golf, Jetta, TT, and TT Quattro models. This vented disc brake rotor features a directional, slotted, and drilled surface designed to enhance braking performance and heat dissipation.

• Nominal thickness: 25 mm with a discard thickness of 23 mm
• Vented rotor design for improved cooling
• Directional slotted and drilled surface for debris removal and heat management
• Zinc silver hat finish with rust-resistant coating
• 5 bolt holes with a 100 mm bolt circle diameter
• Outside diameter of 312 mm and overall height of 34.2 mm
• Center hole diameter of 65 mm and stud/lug hole diameter of 15.75 mm

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

The DFC Brake Rotor - Drilled and Slotted - Silver line from Dynamite Friction focuses on rotors that combine drilled holes and slots on the braking surface. This design helps maintain consistent braking by allowing gases, dust, and water to escape, reducing brake fade and improving pad bite. The zinc silver hat finish and rust-resistant coating extend the rotor’s service life by protecting against corrosion, making it suitable for Audi and Volkswagen vehicles that require reliable stopping power under various driving conditions.

Technical Description and Specifications

This disc brake rotor is vented, which means it has internal vanes between the two friction surfaces to promote airflow and heat dissipation during braking. The rotor’s nominal thickness is 25 mm, with a discard thickness of 23 mm, indicating when replacement is necessary. The rotor surface is finished plain, while the hat area features a zinc silver coating to resist rust. The rotor is directional, meaning it must be installed in a specific orientation to optimize the slotted and drilled surface’s effectiveness. It includes five bolt holes arranged on a 100 mm bolt circle diameter, compatible with the specified Audi and Volkswagen models.

Applications and Problem Solving

• Compatible with Audi Golf, Jetta, TT, and TT Quattro models requiring vented, drilled, and slotted rotors
• Helps reduce brake fade during aggressive or repeated braking
• Improves water and debris evacuation from the rotor surface for consistent braking in wet conditions
• Minimizes rust and corrosion on the rotor hat for longer service life
• Maintains proper braking performance by indicating discard thickness for timely replacement

Installation Notes and Tips

Ensure the rotor is installed with the directional surface oriented correctly according to the vehicle’s rotation direction. Verify the bolt hole pattern matches the vehicle’s hub (5 bolts on a 100 mm circle). Check rotor thickness before installation to confirm it meets or exceeds the nominal thickness of 25 mm. Clean the rotor surface of any protective coatings or residues before mounting brake pads. Proper torque specifications should be followed for lug nuts to avoid rotor warping.

Quality Assurance

The Dynamite Friction DFC Brake Rotor - Drilled and Slotted - Silver (631-74021R) is manufactured to meet OEM standards for fitment and performance on Audi and Volkswagen vehicles. The rust-resistant coating and zinc silver hat finish contribute to durability and corrosion resistance. While specific warranty details are not provided, the rotor’s design and materials align with industry expectations for reliable braking components.