2006-2023 Audi Models Zirconium Inserts in Brake Piston TSB

Audi Technical Service Bulletin (TSB) 46 23 40, also known as 2069078/1, was issued on January 5, 2023. This bulletin provides specific guidance for technicians who encounter loose zirconium inserts within the brake pistons of ceramic brake systems. This TSB applies to all Audi models manufactured between 2006 and 2023 that are equipped with ceramic brakes. For owners concerned about Audi e-tron loose zirconium inserts, this document offers clarity.

Symptoms

This particular issue is unique because it is not typically reported by customers as a noticeable problem. Owners will generally not experience any specific symptoms or warning lights related to this condition. Instead, the presence of loose zirconium inserts is usually discovered by technicians during routine diagnostic work or when performing other services on the brake calipers, such as replacing brake pads. The primary workshop finding is that the zirconium inserts are not firmly attached to the brake piston; they may be loose or can be easily turned or moved within their housing. This condition does not affect the normal operation of the braking system.

Technical Background

Zirconium inserts are a critical component within Audi's ceramic brake systems, specifically designed to manage the extreme temperatures generated during braking. Their main function is to act as thermal insulators, preventing the intense heat from the brake pads from transferring directly to the brake piston. This insulation is vital for protecting sensitive components like the brake caliper seals and the brake fluid from excessive heat exposure. Maintaining optimal temperatures for these components ensures the long-term integrity and consistent performance of the braking system. Figure 1 in the TSB illustrates these zirconium inserts (labeled as item A) within the ceramic brake system.

Repair Procedure Summary

The repair for this condition is straightforward and aims to correct the position of the loose inserts without requiring extensive part replacement. When a loose zirconium insert is identified during service, the technician's task is to simply fit the zirconium insert back into its correct position within the brake piston. The TSB explicitly states that it is "neither necessary nor justified to replace the brake caliper" for this issue. This guidance is important as it prevents unnecessary and costly part replacements. The bulletin also reassures that "The brake system's functions are not affected" by the presence of these loose inserts, meaning the vehicle's braking performance and safety are not compromised. This applies to all affected models, including those with Audi e-tron loose zirconium inserts.

Important Warnings for Owners

Owners of 2006-2023 Audi models with ceramic brakes should be aware of specific points highlighted in this TSB:

• No Customer Concerns: You will likely not experience any symptoms or issues related to this condition. It is typically found only during technician inspection.
• No Safety Impact: The TSB explicitly states that "The brake system's functions are not affected." This means the loose inserts do not compromise your vehicle's braking performance or safety.
• Do Not Replace Brake Caliper: If this condition is identified, the repair involves simply refitting the insert. It is "neither necessary nor justified to replace the brake caliper," which can be a costly component. Ensure your service center follows this guidance.

Warranty Information

Audi Technical Service Bulletin 2069078/1 is classified as "informational only" and is "not applicable to any Audi warranty." This means that while it provides crucial technical guidance for technicians, any service performed under the scope of this TSB would not typically be covered by standard Audi warranty provisions unless other underlying warranty-eligible issues are present.

Additional Information for Technicians

The TSB notes that all part and service references provided, including the TSB number 2069078, are subject to change or removal. Technicians are advised to always check with their Parts Department and/or the Electronic Parts Catalog (ETKA) for the most current information and parts bulletins. Furthermore, the Repair Manual should be consulted for specific instructions regarding fasteners, bolts, nuts, and screws that require replacement during any repair procedure. This ensures proper reassembly and adherence to Audi's service standards. If you are concerned about Audi e-tron loose zirconium inserts, consult your dealer.

NHTSA ID: 10230640