The trailer hand valve should be used 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 The trailer hand valve should be used to: Answers Stop the vehicle. Test the trailer brakes. Check the connection between the trailer and tractor. 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.
