What does the abnormal parking system of Nazhijie u6 mean?

Hello, dear! 1, does the engine suddenly shake when the brake pedal is pressed (note that it is not before the gear is engaged)? It can be observed by the tachometer. If yes, check the vacuum booster. If not, let's look at the second one. 2. Check the brake switch on the brake pedal, because Volkswagen is now controlled by bus, and the EPC light is on, indicating that the throttle system is faulty. But because it is an electrical joint inspection, when you step on the brake pedal, the brake switch is also an important part of the whole electronic throttle control system, so it is easy to cause this code to alarm. Focus on checking! I hope I can help you, and please set it as the best answer! thank you