Home › CDL Practice Tests › Combination Vehicles Questions › Question 68
Why is hard braking during trailer sway dangerous?
- A.It can lock trailer wheels, increase the swing, and push the combination toward a jackknife or rollover
- B.It uses too much air
- C.It only wears the brakes
- D.It makes the trailer lighter
Correct answer
A. It can lock trailer wheels, increase the swing, and push the combination toward a jackknife or rollover
Why
A swinging trailer needs stability, not a sudden change in forces. Locked or heavily braked wheels lose side grip, so the trailer can slide farther sideways instead of recovering.
Manual topic: Combination Vehicles - Rollover and Rearward Amplification · From the Combination Vehicles practice bank (CV-068).