BC Air Brake 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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