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Air Brake (Q Endorsement) Practice · Question

Maximum allowable air leakage with brakes applied on a single vehicle is:

Brakes applied, single vehicle: max 2 psi/min (3 psi/min for tractor-trailer combination).

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Question: Maximum allowable air leakage with brakes applied on a single vehicle is:

Answer options: ✅ 2 psi/min

  • 3 psi/min
  • 5 psi/min
  • 10 psi/min

Correct answer: 2 psi/min

Explanation: Brakes applied, single vehicle: max 2 psi/min (3 psi/min for tractor-trailer combination).

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