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Truck acts like brakes are on


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I have a 2013 mp8 with a mdrive transmission.  Sometimes when I stop the truck won’t go acts like the brakes are on or when I shift to drive or reverse does the same thing any ideas what it could be a valve or something

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Grade Gripper is sticking and keeping brakes engaged/ slow to release. Mack has released a couple of service bulletins on this .  It was a common problem. Fix was a new solinoid valve and quick release valve  

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