Practice question

To release a dolly's air brakes before positioning the converter dolly for coupling, you should:

  1. Remove the dolly parking brake control.
  2. Open the air tank petcock.
  3. Raise the dolly support.
  4. Remove the pintle hook.

Answer: B — Open the air tank petcock.

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

Practice more: Indiana CDL Double Test 2 →