TSB: Audi Brake Booster Vacuum Loss

This bulletin applies to 2020-2025 Audi A8 and S8 vehicles. The customer may experience a brake system warning light and increased brake pedal effort. Thermal deformation of the vacuum line to the brake servo may have occurred due to excessive heat in the engine compartment (restricting the line). Replace the affected vacuum line and add heat reflective matt P/N 4N0612169 to the vacuum line.