Besides moisture, what other common contaminant can damage air brake valves and seals over time?
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Correct!
Not quite. The correct answer is highlighted.
Correct answer to question 18 (Air Brakes): Compressor oil that has worked its way into the air lines
Why
Small amounts of oil from the compressor can carry into the air system over time, and that oil attacks the rubber seals and diaphragms in valves and chambers just as moisture does.
Updated: November 2026
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