Home › CDL Practice Tests › Combination Vehicles Questions › Question 31
Why should you use wheel chocks or ensure trailer spring brakes are set before the tractor contacts the trailer?
- A.To make the trailer heavier
- B.So the trailer does not roll or be pushed forward when the fifth wheel meets the apron
- C.To test the chocks themselves
- D.Chocks are only for parking overnight
Correct answer
B. So the trailer does not roll or be pushed forward when the fifth wheel meets the apron
Why
Even a gentle contact can nudge an unbraked trailer, especially on a slight grade. Holding the trailer still keeps the kingpin and landing gear from being stressed sideways.
Manual topic: Combination Vehicles - Coupling · From the Combination Vehicles practice bank (CV-031).