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Does it feel like you have had a blow-out on your truck? If that is how it feels, then make sure you keep your speed under 65 mph. This same thing has happened to us if we hit a pothole or a bridge ridge that is too high then the truck starts bouncing violently like we had a blow-out, or like you've just driven over a ton of small speed bumps put together. We don't brake but slow down and then it smooths out. I have pulled over several times to check for a flat tire.
Someone told me this is the ABS brakes...but we haven't found out the answer yet. We have a Cummins 1-ton dually.
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