Practice question

Which statement is correct about trailer air supply for the Arkansas CDL Combination Vehicles test?

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

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

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