Question 1
Combination Vehicles
Question 1 of 3
You're hooking a tractor to a trailer. After connecting the air lines and before backing under the trailer you should:
Activate air supply to the trailer(s) then lock the trailer brakes
Pull forward to test the strength of the air line connection
Activate air supply to the trailer(s) and leave the trailer brakes unlocked
Be sure not to activate air supply to the trailer(s) to prevent damage to the air delivery system