Only if for some reason the gas pedal gets stuck to the floor, like what happened to some Toyotas. Even then, pressing hard on the brake should still stop your car, though much more slowly.
Yes, Brakes can be used in Auto transmission car when the Engine is off.
Which ever axle the brakes have worn out.
Definitely not. There is nothing electrical there. But hydraulics run well only when you have your engine on. So: as long as you have your engine on you have full brakes.
Engine. Horn. Muffler. Stereo. Brakes.
Engine, transmission, steering, brakes, electrical, suspension
The engine, a chassis, the transmission and gearbox, the brakes, the steering, and the frame
No completely separate from engine/cooling system
In the engine, transmission, rear end, tires, brakes, etc.
Yes. Assuming the brake system is not damaged brakes can always stop a car faster than the engine can acellerate it. You can think of it this way. Brakes can generate more "negative horsepower" than an engine can generate positive horsepower.
The engine doesn't have to use as much fuel when the car is traveling downhill.
If this car has power brakes, the power booster may be bad, causing a large vacuum leak when the brakes are applied, causing the engine to stall.
Probably a car without an engine or any wheels.