Ontario Air Brake Practice · Question
What is the function of the foot valve (treadle valve) in an air brake system?
The foot valve, or treadle valve, is operated by the driver's foot and allows for modulated control of the service brakes. The harder the pedal is pressed, the
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Question: What is the function of the foot valve (treadle valve) in an air brake system?
Answer options:
- To apply the parking brake only. ✅ To control the amount of air pressure delivered to the service brake chambers.
- To prevent air from re-entering the compressor.
- To automatically drain moisture from the air tanks.
Correct answer: To control the amount of air pressure delivered to the service brake chambers.
Explanation: The foot valve, or treadle valve, is operated by the driver's foot and allows for modulated control of the service brakes. The harder the pedal is pressed, the more air pressure is delivered to the brake chambers, resulting in increased braking force.
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