Air Brake (Q Endorsement) Practice · Question
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.
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Question: 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.
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