How did Audi, Toyota and Tesla deal with the three ＂brake failure＂ events in history？

There have been three major incidents of "brake failure" in history. In 1986, Audi was in the United States, in 2009, Toyota was in the United States, and in 2021, Tesla was in China. Let’s not talk about the real reason for the time being. Let’s talk about the result first. Audi’s solution was a failure, which directly led to Audi’s sales drop in the following years, and then it was not an opponent of Mercedes-Benz BMW at all. Toyota solved the problem very successfully. After the truth came out, the stock price rose sharply and the sales volume rose sharply. Tesla’s solution was quite a failure this time, but it is not known whether it will affect sales.