When should you use the hand valve (trolley valve)?

To test the trailer brakes.. Section 6.2: The hand valve should not be used for parking or normal braking. Use it to test the trailer

When should you use the hand valve (trolley valve)?

ANSWER BREAKDOWN
  • A. Incorrect. "To park." is not correct. The hand valve should not be used for parking or normal braking. Use it to test the trailer brakes.
  • B. Correct. The hand valve should not be used for parking or normal braking. Use it to test the trailer brakes.
  • C. Incorrect. "To stop normally." is not correct. The hand valve should not be used for parking or normal braking. Use it to test the trailer brakes.
  • D. Incorrect. "To prevent jackknifing." is not correct. The hand valve should not be used for parking or normal braking. Use it to test the trailer brakes.