Question When leaving your vehicle, you should: Answers Apply the parking brake. Apply the air brakes. Not apply any brake. Disconnect the trailer. Explanation You should always apply the parking brake when leaving your vehicle. This questions appears in the following tests: Connecticut Class B Knowledge Test Indiana Passenger Maryland Class B Knowledge Test Massachusetts Class A Knowledge Test Nevada Class A Knowledge Test New Jersey Tank New Jersey Passenger New Jersey Passenger South Carolina Passenger West Virginia Class B Knowledge Test West Virginia Passenger Wyoming Class B Knowledge Test