TapTechNews user Da Guogai and Listening to Memories provided clues! TapTechNews reported on May 13th that Wang Hua, the general manager of the public relations department of Xiaomi Group, responded to the issue of the brake failure of Xiaomi SU7 on Weibo today: After verifying, it is indeed a software misidentification. The small probability event has been fixed, so there is no need to panic. Wang Hua stated that they have enlisted the help of engineers from the automotive department to analyze the situation. It was confirmed that the vehicle mistakenly triggered the backup braking strategy due to the wrong identification of the brake master controller (DPB/BCP) at that time, and the brake auxiliary controller (ESP/BCS) directly responded to the braking demand to provide braking deceleration for the vehicle; at the same time, the large screen of the vehicle also displayed a brake system fault prompt. During the process, the vehicle entered the backup strategy of the braking system, and ESP extracted DPB brake fluid to increase the braking pressure on the wheels and enable the vehicle to brake; due to the brake fluid being extracted by ESP from DPB, the pressure in the brake master cylinder quickly decreased, resulting in insufficient pedal feel for the driver. Because the braking system switched between primary and secondary, although the pressure value in the master brake cylinder was 0, it did not mean the complete loss of braking force. At this time, ESP intervened in the braking, and there was no complete brake system failure or loss of control. Wang Hua stated that the braking system of SU7 is designed with a DPB+ESP dual backup mechanism. In addition, he also revealed part of the timeline: In the early morning of May 9th, the accident vehicle was rescued and towed to the Changsha service center. The store staff checked the vehicle hardware and confirmed that there were no mechanical faults/damages. After operating the vehicle's brake system self-check program, the large screen brake fault prompt disappeared, and the vehicle returned to normal. During the day on May 9th, the store staff synchronized the vehicle's situation and technical conclusions to the user, and informed the user that the check records of the vehicle and the vehicle log data are complete and accessible. Currently, the vehicle has returned to normal, but based on a responsible attitude towards users, the staff informed the user that they can support the user's requests for returning/exchanging the vehicle, while also covering the costs incurred (such as exchanging vehicles, which will be given priority in production based on the original order number and provide compensatory waiting period transportation). Regarding the issue of 400 calls not being answered, Wang Hua explained that due to the peak of incoming calls at the time, there were many callers waiting in line, which led to the situation of not being able to answer calls in a timely manner, and deeply apologized for this. Subsequently, the user-specific service group responded to the user's needs and arranged road rescue support. For the shortage of professional customer service representatives, we initiated emergency recruitment in April and expect that the online customer service acceptance rate will significantly increase by the end of May. The SOS is mainly a response channel for medical rescue of injured persons in vehicle accidents, provided by professional platform organizations in the industry; other vehicle usage scenarios are mainly provided by Xiaomi's after-sales service. Wang Hua thanked the user for their feedback on the brake issue and called on netizens not to believe or spread rumors. Previous situation summary by TapTechNews: According to Red Star News, on the evening of May 8th, Mr. Li from Lei Yang, Hunan, drove his newly purchased Xiaomi SU7 car, which had not been owned for a month, and during the parking process, the brakes seemed to suddenly fail. The car emitted an alarm sound, and the screen subsequently displayed 4 abnormal mes
sages such as brake system failure. Because the reverse speed was slow, the vehicle automatically stopped, and Mr. Li called the SOS emergency system in the car, but no one answered for a long time. An hour and a half later, local road rescue arrived and towed the vehicle back to the Changsha delivery center. Strangely, the car miraculously recovered after being inspected, and the after-sales service said it could be driven away at any time, but Mr. Li dared not. He wanted to find out the cause of the vehicle failure.