Home › CDL Practice Tests › Combination Vehicles Questions › Question 54
Why should the tractor parking brake be set before you go back to work on the landing gear and lines?
- A.It speeds up cranking the gear
- B.So the tractor cannot roll while you are beside or between the units
- C.It keeps the air pressure higher for looks
- D.It is only needed if the engine is off
Correct answer
B. So the tractor cannot roll while you are beside or between the units
Why
Uncoupling puts you in the danger zone beside the drive tires and under the trailer edge. A set parking brake is the simple barrier between routine work and a roll-away.
Manual topic: Combination Vehicles - Uncoupling · From the Combination Vehicles practice bank (CV-054).