What is the primary purpose of air storage tanks in a bus?

The primary purpose of air storage tanks in a bus is to hold compressed air. This compressed air is essential for operating the air brake system, which is critical for the safe and effective braking of the vehicle. The air storage tanks provide a reserve of compressed air that can be used to release the brakes and activate other air-operated systems within the bus, ensuring that they function properly under various driving conditions.

Having a reliable supply of compressed air is vital, especially for large vehicles like buses, where braking performance is paramount for passenger safety. Furthermore, the air storage tanks ensure that there is enough air available for repeated braking actions, which is essential during frequent stops or in hilly terrain.

The other options do not pertain to the function of air storage tanks in a bus. Fuel storage and brake fluid are managed differently in the vehicle, while engine cooling is handled by the cooling system, which involves coolant and a radiator rather than air storage tanks.