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debris in seal. If alloy rims, there may be corrosion around the valve. Old or rotted out rubber valve.

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Q: Why would all the air escape through the bottom of the treadle valve?
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What controls how much air is supplied to put on the brakes?

The treadle valve.


What lever is connected to the brake pedal and controls how much air is sent to the brake chambers?

Treadle valve.


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