The driver was driving uphill when his RAM ProMaster suddenly lost power and rolled back down the hill, hitting a tree and stopping. During this time, the driver had absolutely no control over the vehicle, and the brakes didnât work at all. The driver attempted to steer the vehicle, pumped the brakes, turned the key, and pulled the emergency brake, but nothing worked. Internal and external cameras captured the entire event. Will provide video upon request, cannot upload.