CDL Combination Test | 83 Questions | 100% Correct Answers

If you cross connect the two air lines the following will result - You will not have air going to the trailer brakes You have coupled with a semi-trailer. In what position should you put the front trailer supports before driving away? - Fully raised with the crank handle secured in its bracket Th trailer air supply control: - Is a red, eight sided knob A device which connects the service and emergency air lines from the truck to the trailer is called.. - Glad hands If one of the glad hands on your blue air line is missing a seal: - You might end up with a service line air leak In order to supply air to the trailer, you must first: - Stop engine so you can hear the brakes The hand valve should be used: - To test the trailer brakes The air leakage rate for a combination vehicle (engine off, brakes on) should not be more than _______ psi per minute - 4 When should you use the hand valve to park a combination vehicle? - Never When you get ready to back under the semi-trailer you should line up - Directly in front of the trailer If the service air line comes apart while you are driving a combination vehicle but the emergency line stays together, what will happen right away - Nothing is likely to happen until you try to apply the brakes