Home › CDL Practice Tests › Combination Vehicles Questions › Question 47
If the trailer has no spring brakes, or you will leave it for a long time, what extra step protects it?
- A.Leave it in gear
- B.Turn its wheels sharply
- C.Rely only on its landing gear to stop rolling
- D.Use wheel chocks so the parked trailer cannot roll
Correct answer
D. Use wheel chocks so the parked trailer cannot roll
Why
Landing gear holds a trailer up, not in place. Chocks provide the rolling resistance that air brakes lose as air slowly bleeds off over time.
Manual topic: Combination Vehicles - Uncoupling · From the Combination Vehicles practice bank (CV-047).