Air Brake (Q Endorsement) Practice · Question
When performing an applied leakage test, with the service brakes fully applied, what is the maximum allowable air pressure drop for a single vehicle (truck or bus) in one minute?
During an applied leakage test, with service brakes fully applied, the air pressure loss for a single unit should not exceed 28 kPa (4 psi) in one minute to ind
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Question: When performing an applied leakage test, with the service brakes fully applied, what is the maximum allowable air pressure drop for a single vehicle (truck or bus) in one minute?
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 leakage test, with service brakes fully applied, the air pressure loss for a single unit should not exceed 28 kPa (4 psi) in one minute to indicate a healthy system free of significant leaks under load.
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