Dynamite Friction 631-31098L Disc Brake Rotor - Rear Left

Overview of Dynamite Friction DFC Brake Rotor

The Dynamite Friction DFC Brake Rotor - Drilled and Slotted - Silver is engineered for BMW Z4 models requiring reliable braking performance. This vented disc brake rotor, part number 631-31098L, features a directional, slotted and drilled surface designed to enhance heat dissipation and maintain consistent stopping power.

• Compatible with BMW Z4 vehicles
• Directional slotted and drilled surface for improved brake cooling
• Vented rotor design to reduce heat buildup
• Rust-resistant zinc silver hat finish
• Nominal thickness of 20 mm with discard thickness at 18.4 mm
• 5 bolt holes with 14.6 mm diameter and 120 mm bolt circle diameter
• Overall diameter of 300 mm and height of 54.1 mm

Detailed Product Features and Specifications

This DFC Brake Rotor - Drilled and Slotted - Silver from Dynamite Friction is crafted with a vented rotor design that helps dissipate heat more effectively during braking, reducing the risk of brake fade. The rotor surface is both drilled and slotted, which aids in channeling away dust, gas, and water, improving brake pad contact and performance. The directional brake surface ensures optimal rotation alignment for the BMW Z4, enhancing braking efficiency.

The rotor’s nominal thickness is 20 mm, with a discard thickness of 18.4 mm, indicating when replacement is necessary to maintain safety and performance. The zinc silver coating on the hat provides rust resistance, extending the rotor’s service life. With 5 bolt holes sized at 14.6 mm diameter and a bolt circle diameter of 120 mm, this rotor fits securely on the BMW Z4 hub assembly.

About the DFC Brake Rotor - Drilled and Slotted - Silver Product Line

The DFC Brake Rotor - Drilled and Slotted - Silver line by Dynamite Friction focuses on delivering rotors with enhanced heat management and surface design. The drilled and slotted features improve brake pad bite and help maintain consistent braking under demanding conditions. This product line is designed to meet the specific requirements of performance-oriented vehicles like the BMW Z4, balancing durability with effective braking response.

Common Applications and Problem Solving

• Reduces brake fade during aggressive driving or heavy braking
• Improves water and debris evacuation for consistent braking in wet conditions
• Minimizes rust and corrosion on the rotor surface
• Maintains brake pad contact for smoother stopping power
• Extends rotor lifespan with vented design to manage heat

Installation Notes and Tips

Ensure the rotor is installed with the directional surface aligned according to the vehicle’s rotation direction. Verify bolt hole alignment with the BMW Z4 hub using the 5 bolt holes and 120 mm bolt circle diameter. Check rotor thickness before installation to confirm it meets the nominal thickness of 20 mm and is above the discard thickness of 18.4 mm. Proper torque specifications should be followed to secure the rotor safely.

Quality Assurance and Warranty

Dynamite Friction manufactures the 631-31098L rotor to meet OEM standards for fit and function on BMW Z4 models. The rust-resistant zinc silver coating and vented rotor design contribute to long-term durability. Warranty information is available through the manufacturer and should be consulted for coverage details.