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Tag: braking
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How To: Brake on long downgrades
The problem  Descending a long downgrade can trigger a runaway even when your brake system is in good working order. Here’s why.  The treadle valve, under the pedal, sends only a small air signal. It activates a relay valve on each axle, which applies the brakes at a pressure that varies with the […]
November 1, 2009
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