What is the purpose of an alcohol evaporator in air brake systems?

What is the purpose of an alcohol evaporator in air brake systems?

• A. Increase the air pressure
• B. Improve fuel efficiency
• C. Reduce brake wear
• D. Reduce the risk of ice in airbrake valves in cold weather

Answer: (D)

In cold weather, moisture in the compressed air can freeze inside brake valves and lines, causing braking problems. An alcohol evaporator adds a small amount of alcohol into the air stream, which lowers the freezing point of that moisture. The alcohol is drawn from a reservoir and vaporizes as the air passes through the evaporator, then mixes with the compressed air. This anti-freeze effect helps prevent ice from forming in the valves, keeping the air brake system functioning reliably in freezing conditions. It isn’t about increasing pressure, fuel efficiency, or reducing wear.

In cold weather, moisture in the compressed air can freeze inside brake valves and lines, causing braking problems. An alcohol evaporator adds a small amount of alcohol into the air stream, which lowers the freezing point of that moisture. The alcohol is drawn from a reservoir and vaporizes as the air passes through the evaporator, then mixes with the compressed air. This anti-freeze effect helps prevent ice from forming in the valves, keeping the air brake system functioning reliably in freezing conditions. It isn’t about increasing pressure, fuel efficiency, or reducing wear.