Dynamite Friction 631-31042R Disc Brake Rotor - Rear Right

Overview of Dynamite Friction DFC Brake Rotor

The Dynamite Friction DFC Brake Rotor - Drilled and Slotted - Silver (part number 631-31042R) is engineered for BMW 320i, 323Ci, 323i, and 328i models. This vented disc brake rotor features a directional, slotted and drilled surface designed to enhance braking performance and heat dissipation.

• Compatible with BMW 320i, 323Ci, 323i, and 328i
• Part number: 631-31042R
• Vented disc brake rotor with drilled and slotted surface
• Nominal thickness: 19 mm; discard thickness: 17.4 mm
• Overall height and rotor height: 60 mm
• Outside diameter: 276 mm
• Directional brake surface for optimized performance
• Rust resistant zinc silver hat finish with plain disc finish
• 5 bolt holes with 14.6 mm diameter and 120 mm bolt circle diameter

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

The DFC Brake Rotor - Drilled and Slotted - Silver line by Dynamite Friction is designed to provide reliable braking performance with enhanced heat dissipation and reduced brake fade. The drilled and slotted surface improves water and debris evacuation, while the vented rotor design helps maintain optimal operating temperatures. The zinc silver coating on the rotor hat offers corrosion resistance, extending the rotor's service life on BMW 320i, 323Ci, 323i, and 328i vehicles.

Technical Specifications and Features

This rotor features a nominal thickness of 19 mm and a discard thickness of 17.4 mm, ensuring clear service limits for safe replacement. The rotor's outside diameter measures 276 mm, with an overall height of 60 mm. It includes five bolt holes with a diameter of 14.6 mm arranged on a 120 mm bolt circle diameter, matching the stud/lug hole pattern of the specified BMW models. The rotor's center hole diameter is 75 mm, and the surface is directional with a slotted and drilled design to optimize braking efficiency.

Applications and Problem Solving

• Replacement rotor for worn or warped brake rotors on BMW 320i, 323Ci, 323i, and 328i
• Improves heat dissipation to reduce brake fade during aggressive driving or heavy braking
• Helps maintain consistent braking performance in wet or debris-prone conditions
• Addresses rotor corrosion issues with rust-resistant zinc silver coating
• Restores proper braking surface for improved pedal feel and stopping power

Installation Notes and Tips

Ensure the rotor is installed on compatible BMW models (320i, 323Ci, 323i, 328i) matching the bolt pattern and dimensions. Clean the hub surface before installation to prevent runout. Torque lug nuts to manufacturer specifications and inspect brake pads for wear when replacing rotors. The directional slotted and drilled surface requires correct orientation during installation for optimal performance.

Quality Assurance

Dynamite Friction manufactures the 631-31042R rotor to meet OEM specifications for fit and function. The rust-resistant coating and vented design contribute to durability and consistent braking performance. Please refer to Dynamite Friction's warranty policy for coverage details.