Audi S4 B9 Wheel Ventilated Brake Disc Front Left Right N/O/S Set 4M0615301Q

Audi S4 B9 Wheel Ventilated Brake Disc Front Left Right N/O/S Set are original, ventilated brake system components designed for the left and right side. Thanks to their factory origin from Audi, they ensure a perfect fit with calipers, hubs, and dust shields, which translates into stable braking performance and predictable vehicle behavior during both daily and dynamic driving.

Specifications and technical data

• SKU: 4M0615301Q
• Mark: Audi
• Condition: Used
• OEM Part Number: 4M0615301Q
• Substitutable numbers: 4M0615301Q, 4M0 615 301 Q
• Location on the vehicle: Front, Left, Right
• Part type: Brake Disc Rotor
• Category: Brake Disc Rotors

Purpose and compatibility with Audi S4 B9

The presented set includes front, ventilated brake discs designed for installation on the left and right side of the front axle in the Audi S4 B9 generation. The design has been engineered to meet the specific requirements of the S-version braking system, accounting for higher thermal loads as well as the vehicle's increased weight and performance. Using original Audi components reduces the risk of vibrations, uneven wear, and compatibility issues with factory calipers and hubs.

Construction of the ventilated brake disc

The ventilated design of the discs allows for efficient dissipation of heat generated during intensive braking, which helps maintain a stable friction coefficient and reduces susceptibility to overheating. The optimized layout of the ventilation channels supports:

• better thermal stability during repetitive, heavy braking,
• reduction of the fading phenomenon,
• even wear of the working surface.

This solution is particularly beneficial in high-performance cars, where the braking system operates in a wider temperature range than in standard versions of the model.

Benefits of using original Audi brake discs

Using original Audi brake discs on the front axle provides a number of practical operational benefits:

• Precise fitment with the hub and caliper, which facilitates installation and reduces the risk of lateral runout.
• Consistency with factory braking characteristics, ensuring that the ABS and stabilization systems operate within the range intended by the manufacturer.
• The ability to maintain a uniform quality standard throughout the braking system, which is essential when servicing premium class vehicles.

The set intended for the left and right side of the front axle allows for the simultaneous replacement of both discs, which is recommended from the perspective of safety and even system operation.

Characteristics of the used product

The offered set of brake discs is a used item, sourced from vehicle dismantling. In practice, this means that before installation, it is worth verifying the condition of the working surface, thickness, and any signs of overheating in accordance with Audi service procedures. Such components are often chosen as an economical solution while maintaining the original manufacturer's specifications, especially in the case of models with higher costs for new parts.

Selection and installation safety

Before purchasing, it is recommended to compare the disc parameters with the service documentation of the specific Audi S4 B9 unit and ensure compatibility with the installed calipers and wheels. Proper installation should include thorough cleaning of the hub, checking for runout, and applying the correct tightening torques, which minimizes the risk of vibrations and uneven wear. For users who want to analyze the process of selecting brake components from the secondary market step-by-step, the following article will be helpful: Second-hand braking system: how to safely select discs, calipers, and ABS?.

If you are planning a comprehensive repair or upgrade of the braking zone in your Audi and need other elements from the same group, such as additional disc sets, compatible pads, or supplementary brake lines, check the available parts in the Audi brake discs category.