What is the function of the push button in a car?

[AdalynnLee]

The push button in a car has three functions: activating the rear window defroster, turning on the air recirculation, and serving as a handbrake. Below is a detailed introduction to the push button: Detailed introduction to the push button: On the airflow (also called mode) control knob, there is a PUSH button in the center (with a rear window defroster symbol below it). Pressing it to light up the indicator activates the rear window defroster. On the temperature (also called climate) control knob, there is a PUSH button in the center (with an air recirculation symbol below it, which is a half-circle with an arrow inside the car). Pressing it to light up the indicator turns on the air recirculation. The push button functions as a handbrake: The third function of the push button is to act as a handbrake. The handbrake, technically known as an auxiliary brake, operates differently from the main brake system. It uses a steel cable connected to the rear brake shoes to apply braking force to the car. Prolonged use of the handbrake can cause the steel cable to undergo plastic deformation. Since this deformation is irreversible, long-term use will reduce its effectiveness and increase the handbrake's travel distance.