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Air Brake (Q Endorsement) Practice · Question

When parking on a slope, you should:

Always apply spring brakes; on steep grades also chock the wheels — never rely on the foot valve to hold the vehicle.

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Question: When parking on a slope, you should:

Answer options:

  • Apply only the foot valve ✅ Apply spring (park) brakes and chock the wheels on steep grades
  • Leave the air system charged with foot brake
  • Use only the trailer hand valve

Correct answer: Apply spring (park) brakes and chock the wheels on steep grades

Explanation: Always apply spring brakes; on steep grades also chock the wheels — never rely on the foot valve to hold the vehicle.

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