Final answer:If the service air line disconnects while driving a combination vehicle but the emergency line remains intact, the brakes will lock immediately. This is due to the pneumatic brake system's reliance on air pressure to control braking, which is compromised when the service line is disconnected. Therefore option B. The brakes will lock is correct.Explanation:If the service air line comes apart while you are driving a combination vehicle but the emergency line stays together, what will happen right away is B. The brakes will lock. This is because in a pneumatic brake system, the service air line controls the brake application by pressurizing the brake system. When this line disconnects, the system's ability to modulate or release the brakes is compromised, leading to an automatic application or locking of the brakes to prevent the vehicle from moving unsafely.It's important to understand that air is used in heavy vehicle brake systems because it is compressible and can store energy efficiently. However, the system must be free of air leaks to work effectively. The presence of air in the brake lines needs proper management, such as bleeding, to ensure the brakes respond correctly and promptly to the driver's inputs....

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