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

Vented brake discs, front left/right for Audi S4 B9, are an original Audi set designed for the front axle, ensuring stable deceleration and predictable vehicle behavior. The set is specifically engineered for the braking system requirements of the S version, which translates to consistent cooperation with factory calipers and safety systems.

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

Application and Fitment for Audi S4 B9

The set of vented front discs has been developed as a component of Audi's premium braking system, intended for dynamic driving and frequent utilization of the engine's full potential. The design is for left and right side mounting on the front axle, allowing for uniform braking characteristics and proper interaction with the factory brake force distribution system.

As an OEM Audi part, the discs maintain factory geometric and material parameters, ensuring they fit original hubs, calipers, and heat shields without requiring modifications. This solution is particularly beneficial for users who wish to keep their car in a configuration close to factory specifications, preserving predictable braking system behavior.

Vented Design and Performance Characteristics

The vented design of the discs promotes efficient heat dissipation generated during intense braking. This reduces the risk of overheating, loss of effectiveness, and the occurrence of vibrations under high thermal loads. Consequently, the braking system better withstands:

• frequent braking from higher speeds,
• long descents,
• dynamic highway driving.

Using dedicated, vented discs on the front axle helps maintain a stable operating point for the brake pads, which translates to consistent braking force and a more linear pedal response.

Benefits of Using Genuine Audi Brake Discs

Choosing genuine Audi brake discs for the S4 B9 is a solution that stands out technically and functionally from aftermarket alternatives. Key advantages include:

• Factory Fitment – maintaining correct geometry and manufacturing tolerances, which minimizes the risk of disc runout and uneven pad wear.
• Compatibility with Safety Systems – proper cooperation with ABS, ESP, and brake assist systems due to predictable friction characteristics.
• Stable Performance Under Load – the vented construction helps maintain consistent braking effectiveness under elevated temperature conditions.

A brake disc set configured this way is especially recommended for drivers who expect a responsive and consistent braking system performance in daily use and during more demanding driving.

Condition, Inspection, and Preparation for Installation

This item comes from the used Audi parts segment, meaning standard workshop verification is recommended before installation: check the working thickness, any lip formation, the flatness of the working surface, and the condition of the pad contact areas. Properly assessed and prepared discs can be an economical yet technically sound solution for users seeking original components from disassembly.

To maximize the set's potential, it is advisable to pair it with appropriately selected brake pads and perform proper bedding-in after installation. This helps reduce the risk of uneven wear patterns and ensures uniform wear over a longer service life.

Selecting Used Braking System Components – Knowledge at a Glance

When choosing used brake discs, it is crucial to pay attention to their technical condition, service history, and compatibility with the specific model version. If you want to check step-by-step what to look for when buying discs, calipers, and ABS components, the following article will be helpful: Used braking system – how to safely choose discs, calipers, and ABS.

Other Audi Brake Discs

If you are also looking for other Audi brake discs for different models or configurations, check out the dedicated category in our store: Audi brake discs. This will allow you to easily compare available variants and select the set appropriate for your car.