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

Question

If a converter dolly has air brakes, you can release the brakes by opening the dolly air tank petcock. Releasing the dolly's brakes is the first step you should take when properly positioning the dolly in front of the rear trailer.

Accepted Answer

Open the air tank petcock.

Answer

Remove the dolly parking brake control.

Answer

Raise the dolly support.

Answer

Remove the pintle hook.