Air Brake (Q Endorsement) Practice · Question
Scenario 220: Using the trailer hand valve only when a trailer starts to skid:
Applying the hand valve during a trailer skid increases trailer brake force and worsens the skid; release brakes to recover. The correct answer is "Makes the tr
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Question: Scenario 220: Using the trailer hand valve only when a trailer starts to skid:
Answer options:
- Helps the trailer recover ✅ Makes the trailer skid worse — release brakes instead
- Has no effect
- Is the recommended technique
Correct answer: Makes the trailer skid worse — release brakes instead
Explanation: Applying the hand valve during a trailer skid increases trailer brake force and worsens the skid; release brakes to recover. The correct answer is "Makes the trailer skid worse — release brakes instead". This capacity-fill scenario 220 reinforces the same competency for the airbrake bank and follows the certified explanation standard.
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