Examkin

Question

Difficulty: MediumSkid Control and Recovery

Applying the trailer hand brake during a trailer skid stabilizes the vehicle by pulling the combination unit into alignment.

Answer: Answer

Answer

False
The statement is false because applying the trailer hand brake is the worst action to take during a trailer skid. It locks the trailer wheels further, preventing them from regaining the rolling traction necessary to follow the tractor. The correct procedure is to release the brakes immediately.

Step-by-Step Solution

1
Identify the underlying mechanical cause of a trailer skid
Trailer skids typically begin when the trailer wheels lose traction or lock up due to over-braking or slippery road surfaces.
Understanding why the trailer is sliding dictates the appropriate physical correction.
2
Evaluate the effect of applying the trailer hand brake (trolley valve)
Applying the hand brake sends air pressure exclusively to the trailer brakes, locking sliding tires and preventing wheel rotation.
Tires that are locked cannot generate the lateral cornering force needed to maintain directional control.
3
Determine the proper CDL emergency recovery procedure
The driver must release all brakes so the trailer wheels can roll freely, regain grip, and follow the tractor.
Re-establishing rolling traction is the only way to arrest the sideways slide and prevent a jackknife.

Key Concept

Trailer skid recovery and avoiding trailer hand brake usage
Estimated Time:1m 0s
Rate this question

Topics

Skid Control and Recovery

More questions from this topic