Do you see tracks stopping when you push on brakes? Check if the track velocity is passed properly into Track Anisotropic Friction components in Update Friction function. The other thing which was weird but I forgot about it, maybe it was just migration bug, there were no input connection in OnComponentHit event branch. The branch is there expecting BlockingHit as input, to be sure the data is passed only when collision happens.
If above doesn’t help, send me BP and I’ll take a look at it, might be missing something.