1. You could lose your brakes while driving.
If the final air brake check is not done to identify and fix air leaks before driving, it can lead to a loss of brake pressure. This means that the brakes may not function properly, potentially resulting in a loss of braking power while driving, which is a significant safety concern.
2. Your fuel usage will increase.
The final air brake check and fixing air leaks are not directly related to fuel usage. Air leaks in the brake system do not typically impact fuel consumption.
3. Tire pressure will drop.
The final air brake check is specifically related to the brake system, not tire pressure. Checking and maintaining tire pressure is a separate procedure that should be done separately to ensure proper tire performance and safety.
Therefore, the correct statement is:
1. You could lose your brakes while driving.