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Question:

"Some air brake systems have an alcohol evaporator. What may happen if you don’t keep the proper level of alcohol?"

A Ice may form in the air brake valves and cause brake failure.
Explaination

Some air brake systems have an alcohol evaporator to put alcohol into the air system. This helps to reduce the risk of ice in air brake valves and other parts during cold weather. Ice inside the system can make the brakes stop working.