Practice question

What is the risk of routine downhill control with only the trailer hand valve?

It improves brake balance
It tests the pintle hook
Trailer-only braking can overheat or lock trailer brakes and contribute to jackknife
It closes service line

Answer: C — Trailer-only braking can overheat or lock trailer brakes and contribute to jackknife

The correct answer is shown above. Try the full quiz for additional practice.