Listen to the sound. See if there is any fetation. The pneumatic butterfly valve of a car, also called "suspension", is composed of a tension spring and a pneumatic butterfly valve.
The pneumatic butterfly valve is not used to support the weight of the car body, but to restrain the shock when the tension spring rebounds after absorbing the shock and absorb the energy of the road impact. If you drive a car with a broken shock absorber, you can understand the bounce of the car after every hole, high and low, and the shock absorber is used to suppress this bounce. Without the shock absorber, it is impossible to control the rebound of the tension spring. When the car encounters high and low roads, it will bounce severely. When it turns, the tension spring will stir up and down, resulting in the loss of tire grip and tracking.
With valve glue, when we travel on some bumpy roads, we don't need to worry about the damage caused by the strong sensation of the car. The function of the valve belt is to make the car body stable when the tires sink, so that we can drive more comfortably.