Question Some air brake systems use alcohol: Answers To reduce the risk of ice forming in air brake valves. To make the compressor run more efficiently. To lubricate parts of the braking system. To reduce the risk of rust forming on air brake valves. Explanation Some air brake systems contain an alcohol evaporator. This device introduces alcohol into the braking system to inhibit the formation of ice. Take a FREE Practice Test Now This questions appears in the following tests: Texas Knowledge Test Class A , Connecticut Knowledge Test Class B , District Of Columbia Knowledge Test Class B , Mississippi Knowledge Test Class B , West Virginia Knowledge Test Class B , Florida Air Brakes , Kansas Air Brakes , New Hampshire Air Brakes , New Jersey Air Brakes , North Carolina Air Brakes , Tennessee Air Brakes , Utah Air Brakes ,