A driver should use the trailer hand valve to: Do you currently have car insurance? Insurance is mandatory to drive in Ohio Yes I have insurance. But please show me your best quotes. No, please help me find the best insurance. Question A driver should use the trailer hand valve to: Answers Uncouple the trailers. Test the trailer brakes. Apply the emergency brakes. Explanation Using a trailer hand valve while driving could create a skid. The trailer hand valve should only be used when testing the trailer brakes. This questions appears in the following tests: Delaware Double Hawaii Double Ohio Double Vermont Double
