Arizona Air Brakes CDL Practice Test

During cold weather, what should you do daily if your vehicle has an alcohol evaporator?

1. Clean the air filter with alcohol

2. Check and fill the alcohol level

3. Change the alcohol from a new bottle

4. Check the oil for alcohol content

The correct answer is: Check and fill the alcohol level

In cold weather, it is essential to maintain the alcohol evaporator because it plays a critical role in preventing ice from forming in the air brake system. The alcohol evaporator introduces alcohol into the air system to lower the freezing point of any moisture present, thereby preventing ice blockages. Checking and filling the alcohol level is crucial because if the level is too low, the evaporator won't function effectively, leading to potential freezing issues that can impair the braking system. Regularly ensuring that there is an adequate level of alcohol allows the system to operate properly and maintain optimal performance, especially in cold conditions. Other options do not address the immediate needs of the alcohol evaporator in cold weather. Cleaning the air filter with alcohol doesn't have the same impact on the functionality of the evaporator. Changing alcohol from a new bottle is unnecessary unless the current supply has been contaminated or expired, and checking the oil for alcohol content is not relevant to the day-to-day functioning of the air brake system. Thus, daily checking and filling the alcohol level is the best practice to ensure safety and reliability during cold weather conditions.