Air Brake (Q Endorsement) Practice · Question
Scenario 26: Treadle valve 'crack' pressure refers to:
Crack pressure is the small pedal/treadle pressure that just begins to open the foot valve and send service air to the brake chambers. The correct answer is "Th
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Question: Scenario 26: Treadle valve 'crack' pressure refers to:
Answer options: ✅ The minimum pedal pressure that begins to send air to the brake chambers
- The maximum allowed pedal pressure
- The cut-out pressure
- Reservoir failure pressure
Correct answer: The minimum pedal pressure that begins to send air to the brake chambers
Explanation: Crack pressure is the small pedal/treadle pressure that just begins to open the foot valve and send service air to the brake chambers. The correct answer is "The minimum pedal pressure that begins to send air to the brake chambers". This capacity-fill scenario 26 reinforces the same competency for the airbrake bank and follows the certified explanation standard.
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