Final answer:
Air brake lag is the time delay between the moment a driver applies the brakes and the moment the brakes actually take effect.
Step-by-step explanation:
The time the air takes to travel through a properly maintained air brake system, approximately 4/10 of a second. BRAKING DISTANCE: The actual distance the vehicle travels after the brake is applied until the vehicle stops. Air brake lag refers to the time delay between the moment a driver applies the brakes and the moment the brakes actually take effect. It is typically measured in seconds.
The value of air brake lag can vary depending on factors such as the design of the brake system, the condition of the brakes, and the speed of the vehicle. For example, in commercial trucks equipped with air brakes, the lag time can range from 0.5 seconds to 2 seconds. This means that it takes between 0.5 and 2 seconds for the brakes to fully engage after the driver presses the brake pedal.