2022-2026 Audi e-tron GT Brake Pedal Knocking Noise TSB

Owners of 2022-2026 Audi e-tron GT and RS e-tron GT models may notice a specific sound during the vehicle's initial operation. This sound, described as a one-off knocking noise when releasing the brake pedal, is addressed by Audi Technical Service Bulletin (TSB) 2071255/2.

This bulletin, identified as 47 24 31 2071255/2 and dated September 10, 2024, provides crucial information regarding this phenomenon. It explicitly states that it supersedes an earlier bulletin, Group 47 number 23-24, which was dated August 18, 2023. The updated bulletin clarifies that the Audi e-tron GT brake knocking noise during the break-in period is considered normal behavior for these vehicles.

Symptoms of the Brake Pedal Knocking Noise

Customers may report hearing a "knocking noise when releasing the brake pedal" during the vehicle's break-in phase. This is typically a distinct, one-off sound. Workshop technicians have confirmed that this specific noise can be consistently reproduced under the conditions described in the bulletin. Furthermore, during the investigation, it was found that the vehicle's "break-in mode" was active, which directly correlates with the observed behavior.

Technical Explanation of the Noise

The technical background provided by Audi explains the root cause of this Audi e-tron GT brake knocking noise. During the vehicle's initial "break-in mode," the energy recuperation function, which normally uses the electric motors to slow the vehicle and recover energy, is temporarily deactivated. This means that the hydraulic brake system is the sole method of retardation (slowing down) during this period.

The audible knocking noise originates from the tandem brake master cylinder. As pressure is released from the brake pedal, the operation of this component produces a sound that is perceived by the driver as a knocking noise. This sound is a normal operational characteristic of the hydraulic braking system under these specific conditions, particularly when the recuperation system is not active.

Important Warnings for Owners

It is critical for owners to understand that this specific Audi e-tron GT brake knocking noise is not an indication of a fault or a defect. Audi explicitly states in TSB 47 24 31 2071255/2 that "No measures or replacement parts are required/justified. This scenario represents normal behavior." This means that authorized Audi service centers will not perform any repairs or replace any components for this condition, as it is considered a normal part of the vehicle's operation during its break-in period.

Once the break-in mode automatically concludes, the recuperation function is reactivated. At this point, the knocking noise should either cease entirely or occur at a significantly reduced level, as the hydraulic brakes will no longer be the sole means of retardation.

Warranty Information

Technical Service Bulletin 47 24 31 2071255/2 is purely informational and serves to clarify a normal operating characteristic. It is important to note that this TSB is "not applicable to any Audi Warranty." Since the condition it describes is not a manufacturing defect or a malfunction, but rather a normal operational sound during a specific phase of the vehicle's life, it will not be covered under any warranty claims. Owners should not expect warranty-covered repairs for this specific brake pedal noise.

NHTSA ID: 11009358