Dynamic Friction 830-31029L Disc Brake Rotor - Front Left

Overview

The Dynamic Friction 830-31029L is a drilled and slotted disc brake rotor built for BMW applications that require a vented front left rotor with a 120 mm bolt circle. Its directional surface, rust-resistant coating, and Geospec Silver Grey hat finish support consistent braking performance and corrosion protection.

Compatible with BMW 740i, 740iL, 540i, 850Ci, and 850i applications, this rotor is engineered around the listed fitment and dimensions. The 830-31029L is a direct-fit brake rotor for drivers replacing a worn or heat-affected front left rotor on supported BMW models.

Key Features

• Drilled and slotted surface for improved pad bite and heat management.
• Vented rotor construction for better airflow through the braking surface.
• Rust-resistant coating helps protect exposed surfaces from corrosion.
• Geospec Silver Grey hat finish for a clean, durable appearance.
• Directional brake surface matched to the rotor design.
• 5-lug pattern with 120 mm bolt circle and 79 mm center hole diameter.

Detailed Description

Dynamic Friction designed the 830-31029L as a performance-oriented brake rotor for BMW 7 Series and 5 Series fitments, along with select 8 Series applications. The slotted X-drilled surface, vented construction, and 324 mm outside diameter work together to maintain stable braking characteristics under repeated use. With a discard thickness of 28.4 mm and nominal thickness of 30 mm, this rotor is specified for the listed applications and position.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Is Used For

• Replacing a worn front left brake rotor on supported BMW models.
• Addressing rotor scoring, pulsation, or uneven braking feel.
• Restoring braking surface thickness after wear reaches service limits.
• Reducing corrosion buildup on exposed rotor surfaces.
• Maintaining proper braking performance on vented rotor applications.

Installation Notes and Tips

Verify rotor dimensions, bolt pattern, and position before installation. This rotor is listed for front left applications only, so confirm the vehicle’s brake setup and match the directional surface orientation during installation. Always inspect pads, caliper condition, and hub surfaces when replacing a brake rotor.

Quality Assurance

Dynamic Friction supplies the 830-31029L with application-specific fitment and corrosion-resistant surface treatment for the listed BMW vehicles. The Geoperformance Rotor line combines drilled and slotted design features with a protective finish for consistent service use.