2022-2024 Audi e-tron GT Brake Disc Surface Cracks TSB

Owners of 2022-2024 Audi e-tron GT and RS e-tron GT models may observe fine cracks on the friction surface of their vehicle's tungsten carbide brake discs. This condition, while potentially concerning at first glance, is addressed by Audi Technical Service Bulletin (TSB) 45 23 34 2065341/2. This bulletin clarifies that these surface cracks are a normal characteristic of the brake system and do not indicate a fault or compromise performance.

Symptoms

The primary symptom reported by customers is the visible presence of cracks on the friction surface of the tungsten carbide brake disc. These cracks typically appear as a network of fine lines across the brake disc's surface.

Technical Background

Audi explains that the tungsten carbide brake discs used in the e-tron GT and RS e-tron GT models feature a hard metal layer applied to the brake disc using a specialized manufacturing process. During normal vehicle operation, the brake system experiences varying temperatures, leading to different rates of thermal expansion between this hard metal layer and the underlying base disc material.

To compensate for these differing thermal expansions, a network of fine surface cracks, known as "relaxation cracks," forms. These cracks are an expected and normal part of the brake disc's behavior. Audi confirms that these relaxation cracks have no negative impact on the function, performance, or comfort of the brake system. Therefore, if you observe these cracks, it is typically not a cause for concern regarding your Audi e-tron GT brake disc cracks.

Important Warnings

Audi Technical Service Bulletin 45 23 34 2065341/2 explicitly states that this TSB is for informational purposes only. It also clarifies that this condition is not covered by any Audi warranty, as it is considered a normal operational characteristic of the tungsten carbide brake discs. No service or production solution is applicable for these specific surface cracks.

Owner Action

If you notice fine surface cracks on the tungsten carbide brake discs of your 2022-2024 Audi e-tron GT or RS e-tron GT, there is generally no need for concern or immediate action. According to Audi TSB 45 23 34 2065341/2, these are normal "relaxation cracks" and do not affect the braking system's performance or safety. You do not need to seek a repair or warranty claim for this specific condition. However, if you experience any other brake-related symptoms, such as unusual noises, vibrations, or reduced braking performance, it is always advisable to have your vehicle inspected by an authorized Audi dealership.

Source: NHTSA ID: 10238316