Practice question

A driver is reviewing trailer air supply. What should they remember?

  1. Pull out to supply trailer air
  2. Use it only for trailer lights
  3. It has no effect on trailer brakes
  4. Push in to supply trailer air after pressure builds; pull out to apply trailer emergency brakes

Answer: D — Push in to supply trailer air after pressure builds; pull out to apply trailer emergency brakes

The correct answer is shown above. Try the full quiz for additional practice.

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