My new custom 2019 double cab 4 x4 just did this, 6,400 miles on it. Went through a car wash put it in drive from neutral, and took off. Breaks acted like they were not power assisted any more. They were acting like the old non power assisted. Had to mash on them to get the truck stopped. At first I thought it was just my imagination but no it was manual breaks only. Turned the truck off to see if that reset the power breaking but that did not work. Got home and disconnected the battery foe a few seconds to see if that worked. It did and the power assist came back. If it does it again I guess a trip to the dealership. by the way I never got any service lights to come on, the power assist just stopped working.