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They say abruptly.

And this is normal in a mistaken accelerator pedal application. You press down on the 'brake', the car speeds up, you panic stomp down on the 'brake' as hard as you can.

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Which would not result in an instant 0% -> 100% reading. One would expect a gradual slope from 0% to, say, 30%, then a sharp increase to 100% some tens or hundreds of milliseconds later.

Normally, from my understanding of these sorts of accidents, you wouldn't fail to move your foot over if you're only braking gently but you might if you need to slam down the brake. As your reflexes slow down as you age you'll find yourself getting into more situations where you need to slam the brake. And it will more often make sense to apply a hard brake now because you know you won't be able to increase the braking force in time later if it becomes necessary. I don't remember the last time I had to slam the brakes in my own driving but when I'm riding with my father he has to do it pretty regularly.

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