NHTSA Complaint #11510001 — 2022 AUDI E-TRON

On 3 separate occasions brake pedal went all the way to the floor without stopping the vehicle. Pumping the brake pedal did not help as brake pedal went to the floor each time. After a few panic pumps all of sudden brakes worked as if nothing had happen. This was not a gradual regain of pedal force but full force as if nothing had happen. Did not see any indications on dashboard at the time and none were present after any of the events listed below. Note - Each event was after car sat in parking lot for at least 4 hours. First time was Jan 23, 2023 at ~ 12,300 miles leaving parking in the morning onto main road. Fortunately no traffic. Second event Feb 8 ~12,900 miles leaving parking lot onto main road in the morning. Fortunately no traffic. Third event Feb 9 ~ 12,940 miles leaving business parking lot in the afternoon and was approaching the exiting gate which rose out of the way in time for car not to hit the barrier. Car was taken to Audi Service on Feb 13, 2023 to be evaluated. Audi Service could not duplicate issue and kept the car for 11 days. Audi technical team advised replacing the brake booster module (PN 4KE-614-100-AG-BEF) which was done by Audi Service in South Burlington, VT. Original Brake Booster removed from car was kept at Audi Service.