Tom: I believe it was the early Ford 6.0L (2004, 2005) where the integrated brake controller had a minimum speed before it would apply the brakes with force. The OP has a Chevy which I don't recall having that "feature".
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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