Ontario Air Brake Practice · Question
During a parked air loss test (engine off, brakes released), what is the maximum acceptable air pressure drop in one minute for a tractor-trailer combination unit?
For a tractor-trailer combination unit, during a static (parked) air loss test with the engine off and brakes released, the air pressure should not drop more th
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Question: During a parked air loss test (engine off, brakes released), what is the maximum acceptable air pressure drop in one minute for a tractor-trailer combination unit?
Answer options:
- 21 kPa (3 psi)
- 14 kPa (2 psi) ✅ 28 kPa (4 psi)
- 34 kPa (5 psi)
Correct answer: 28 kPa (4 psi)
Explanation: For a tractor-trailer combination unit, during a static (parked) air loss test with the engine off and brakes released, the air pressure should not drop more than 28 kPa (4 psi) in one minute.
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