Air Brake (Q Endorsement) Practice · Question
Air-pressure build-up from 50 psi to 90 psi should take no longer than:
On a typical commercial vehicle, building from 50 to 90 psi should take no more than about 3 minutes.
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Question: Air-pressure build-up from 50 psi to 90 psi should take no longer than:
Answer options:
- 10 seconds ✅ 3 minutes
- 5 minutes
- No time limit
Correct answer: 3 minutes
Explanation: On a typical commercial vehicle, building from 50 to 90 psi should take no more than about 3 minutes.
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