What is the purpose of an alcohol evaporator in a truck's air brake system?

The purpose of an alcohol evaporator in a truck's air brake system is primarily to reduce the risk of ice formation in cold weather. When moisture in the air brake system condenses, it can freeze under low temperatures, leading to potentially hazardous situations where the brakes could become inoperable or function erratically. The alcohol evaporator introduces an alcohol-based fluid into the air system, which helps to absorb moisture and prevent the formation of ice. This is particularly critical for maintaining the reliability and safety of the brake system during winter conditions or in cold climates, ensuring the brakes remain functional when needed most.