Ontario Class A Practice Test · Question
When uncoupling a semi-trailer, after parking on level ground and applying trailer brakes, what is the next safety step before disconnecting air and electrical lines?
After positioning and applying trailer brakes, the most crucial next step is to lower the landing gear until it firmly contacts the ground, supporting the trail
Start free practice for Ontario Class A Practice Test
50 questions · no signup required · 40 free questions per day
Question: When uncoupling a semi-trailer, after parking on level ground and applying trailer brakes, what is the next safety step before disconnecting air and electrical lines?
Answer options:
- Drive the tractor forward slowly.
- Retract the landing gear fully. ✅ Lower the landing gear firmly to the ground.
- Remove the kingpin lock.
Correct answer: Lower the landing gear firmly to the ground.
Explanation: After positioning and applying trailer brakes, the most crucial next step is to lower the landing gear until it firmly contacts the ground, supporting the trailer's weight. This prevents the trailer from falling when the tractor is removed.
Start free practice for Ontario Class A Practice Test
50 questions · no signup required · 40 free questions per day
More about Ontario Class A Practice Test
Related Questions
- Approaching a sign that reads 'Runaway Lane / Emergency Escape Ramp Ahead', what is the immediate significance
- A rectangular sign with a truck symbol and an upward-pointing arrow, followed by 'Steep Grade', combined with
- What is the correct interpretation of a 'Oversize Load' sign displayed on a pilot vehicle in front of a flatbe
- A commercial vehicle displaying a red flag at the rear of its load indicates:
- You see a rectangular yellow sign with 'LONG VEHICLE' written in black letters. What information does this con
- A sign on the side of a transport truck reads ‘WIDE LOAD’. Which of the following is most probable about the v
More for Ontario Class A Practice Test candidates
Practice tests
Question explanations
- Approaching a sign that reads 'Runaway Lane / Emergency Escape Ramp Ahead', what is the immediate significance
- A rectangular sign with a truck symbol and an upward-pointing arrow, followed by 'Steep Grade', combined with
- What is the correct interpretation of a 'Oversize Load' sign displayed on a pilot vehicle in front of a flatbe
- A commercial vehicle displaying a red flag at the rear of its load indicates:
Ready to practice?
Free, no signup required. Build a wrong-question list as you go.
Start Free Ontario Class A Practice Test Practice →Related courses
Other Canadian certifications candidates often prepare for alongside this one.