Air Brake (Q Endorsement) Practice · Question
During an applied pressure test, the air pressure loss in a single unit commercial vehicle with air brakes should not exceed how much over one minute with the engine off?
During an applied pressure test, the air pressure loss in a single unit commercial vehicle (straight truck or bus) should not exceed 28 kPa (4 psi) over one min
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Question: During an applied pressure test, the air pressure loss in a single unit commercial vehicle with air brakes should not exceed how much over one minute with the engine off?
Answer options:
- 14 kPa (2 psi)
- 21 kPa (3 psi) ✅ 28 kPa (4 psi)
- 34 kPa (5 psi)
Correct answer: 28 kPa (4 psi)
Explanation: During an applied pressure test, the air pressure loss in a single unit commercial vehicle (straight truck or bus) should not exceed 28 kPa (4 psi) over one minute with the engine off and the service brake applied with firm pressure.
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