Home › CDL Practice Tests › Combination Vehicles Questions › Question 12
Before backing under, what should you check about the trailer brakes?
- A.The trailer brakes must be fully released
- B.Only one trailer brake needs to work
- C.Trailer brakes are not checked until after coupling
- D.The trailer should be secured so it cannot roll, using its spring brakes or wheel chocks
Correct answer
D. The trailer should be secured so it cannot roll, using its spring brakes or wheel chocks
Why
A trailer that can roll when the fifth wheel contacts it can shift, fall, or run away. Setting its brakes or chocking its wheels keeps it in place during coupling.
Manual topic: Combination Vehicles - Coupling · From the Combination Vehicles practice bank (CV-012).