Combination Vehicles Test

Start Over - Tests Index

Questions 1 to 5 of 16
  1. What happens to the trailer emergency brakes if there is a loss of pressure in the emergency line?
  2. When the emergency line loses pressure, what happens to the tractor protection value?
  3. If the air lines on a truck are color coded, which lines are blue?
  4. To connect the glad hands, the tow seals are pressed together with the couplers at what kind of angle to each other?
  5. Why should you lock the glad hands to each other when you are not towing any trailers?