Air Brake (Q Endorsement) Practice · Question
During a static air leakage test on a combination vehicle, what is the maximum allowable air pressure drop in one minute after the initial drop?
For a combination vehicle (tractor-trailer), the acceptable air loss rate during a static leakage test is 48 kPa (7 psi) in one minute after the initial pressur
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Question: During a static air leakage test on a combination vehicle, what is the maximum allowable air pressure drop in one minute after the initial drop?
Answer options:
- 14 kPa (2 psi)
- 28 kPa (4 psi)
- 34 kPa (5 psi) ✅ 48 kPa (7 psi)
Correct answer: 48 kPa (7 psi)
Explanation: For a combination vehicle (tractor-trailer), the acceptable air loss rate during a static leakage test is 48 kPa (7 psi) in one minute after the initial pressure drop. This higher allowance accounts for the increased volume and connections in a combination unit.
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