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Air Brake (Q Endorsement) Practice · Question

During a pre-trip inspection of an air brake system, what is the maximum allowable air pressure drop in one minute for a single commercial vehicle (truck or bus) after the initial drop?

According to Canadian provincial air brake manuals, for a single unit (truck or bus), the air loss rate should not exceed 28 kPa (4 psi) in one minute after the

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Question: During a pre-trip inspection of an air brake system, what is the maximum allowable air pressure drop in one minute for a single commercial vehicle (truck or bus) after the initial drop?

Answer options:

  • 14 kPa (2 psi) ✅ 28 kPa (4 psi)
  • 34 kPa (5 psi)
  • 69 kPa (10 psi)

Correct answer: 28 kPa (4 psi)

Explanation: According to Canadian provincial air brake manuals, for a single unit (truck or bus), the air loss rate should not exceed 28 kPa (4 psi) in one minute after the initial air pressure drop. Exceeding this indicates a potential leak that must be addressed before operation.

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