Practice question

When uncoupling, why do drivers often ease pressure off the fifth wheel lock before pulling the release handle?

  1. It charges the trailer air tanks
  2. It turns on trailer ABS
  3. Binding can prevent the lock from releasing smoothly
  4. It raises the landing gear

Answer: C — Binding can prevent the lock from releasing smoothly

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

Practice more: IN CDL Combination Practice Questions - Indiana CDL Combination Vehicles Test Exam →