I purchased a new 2014 sierra 1500 with RWD. Twice today Itried to park; truck was gear shifted to P. However, the truck began to roll backwards as I was on a very slight incline. Quickly pressed the breaks to stop the rollng. If I had not been there somene could have been hurt! Has anyone had or heard of this type problem. There has to some sor o malfunction somewhere as this can be dangerous
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