Automatic transmission is downshifting
Yes coasting downhill will save you fuel. However do not do this with a vehicle equipped with automatic transmission. You will damage the automatic transmission by coasting. You can do this with a manual transmission but do not shut the engine off. This would cause you to loose power steering and power brakes.
you can contact All Automatic 928-768-4112 and ask bobby
The driver suddenly applied the brakes.
Inertia
With a manual transmission you downshift to slow down in situations where in an automatic you would have to use the brakes. Using brakes more = brakes wearing faster.
Yes, Brakes can be used in Auto transmission car when the Engine is off.
NO
Because you are decelerating sharply
First, coasting is illegal in some countries and US- States and in Europe it would be a reason to fail the driving test. Second, a driver has no longer full control of the car. If you drive a manual transmission and coast in neutral you have to rely on your brakes only. You are no longer able to accelerate or use the engine brake until putting in a gear again. And this takes time. Maybe just a second, but one a driver doesn't want to spare in case of emergency. Putting the car in neutral and brake then is also shortening the life of the brakes dramatically. Shifting down properly and use both engine and mechanical brakes is the better way (and don't worry about the clutch, a clutch is designed for that). P. S. When it comes to automatic transmission I'm no help. No automatics in Germany, fortunately.
Wheel Bearings are most likely worn.
Brakes.