Examkin

Soru

Zorluk: ZorSkid Control and Recovery

When an unladen semi-trailer begins swinging laterally during braking on a slick roadway, applying the trailer hand brake (trolley valve) will stabilize the combination unit by stretching the vehicle combination taut.

Cevap: Cevap

Cevap

False
The statement is false because commercial driving safety standards strictly prohibit using the trailer hand valve to straighten a sliding trailer. A trailer skid occurs when the trailer tires break traction and lock up. Applying the trailer hand brake exacerbates the wheel lockup, depriving the tires of the rolling motion required to generate lateral cornering grip and rapidly worsening a trailer jackknife. The proper response is to release all braking pressure immediately so the trailer tires can spin, regain adhesion, and trail straight behind the tractor.

Adım Adım Çözüm

1
Analyze the mechanics of a trailer skid and tire traction.
A trailer skids and swings laterally when its wheels lock up or lose directional grip due to excessive braking or lack of weight on the trailer axles.
Locked or sliding tires have zero lateral cornering traction and are free to slide sideways due to road crown or centrifugal forces.
2
Evaluate the effect of applying the trailer hand brake (trolley valve) during an active trailer skid.
Engaging the trailer hand brake applies continuous friction to the trailer brake drums/rotors, locking the trailer wheels further.
The only way to recover from a trailer skid is to release all brakes so the trailer wheels can roll freely, restore traction, and naturally align behind the towing tractor.

Anahtar Kavram

Trailer Skid Recovery and Prohibition of Trailer Hand Brake Use
Tahmini Süre:1m 0s
Bu soruyu puanla

Konular

Skid Control and Recovery

Bu konudan daha fazla soru