What is the danger of using the 'Trailer Hand Valve' while driving?

It can cause the trailer to skid (jackknife).. Section 6.2: Do not use the hand valve while driving. It can cause trailer wheels to lock up

What is the danger of using the 'Trailer Hand Valve' while driving?

ANSWER BREAKDOWN
  • A. Correct. Do not use the hand valve while driving. It can cause trailer wheels to lock up and skid (trailer jackknife).
  • B. Incorrect. "It saves the service brakes." is not correct. Do not use the hand valve while driving. It can cause trailer wheels to lock up and skid (trailer jackknife).
  • C. Incorrect. "It steers the trailer." is not correct. Do not use the hand valve while driving. It can cause trailer wheels to lock up and skid (trailer jackknife).
  • D. Incorrect. "It increases speed." is not correct. Do not use the hand valve while driving. It can cause trailer wheels to lock up and skid (trailer jackknife).