Arizona Air Brakes CDL Practice Test

What is the purpose of an alcohol evaporator in a vehicle?

1. Reduce the risk of ice in air brake valves in cold weather

2. Eliminate the need for daily tank draining

3. Rid the wet tank of alcohol that condenses

4. Boost tank pressure like superchargers

The correct answer is: Reduce the risk of ice in air brake valves in cold weather

The purpose of an alcohol evaporator in a vehicle's air brake system is to reduce the risk of ice forming in the air brake valves during cold weather. When temperatures drop, moisture in the air can condense and freeze within the air lines and valves, causing potential blockages or malfunctions in the brake system. The alcohol evaporator introduces alcohol, which has a lower freezing point than water, into the air system. This alcohol helps to absorb moisture and prevents ice from forming, thus ensuring the air brake system remains functional and reliable in cold conditions. While other components of the air brake system serve distinct purposes, the specific role of the alcohol evaporator is focused on managing moisture to avoid freezing issues, making it crucial for safe operation in low-temperature environments.