[ALittleLight]

Accidents tend to happen when multiple things "go wrong". If a car accident happened every time some single thing was imperfect - well, car accidents would be more common than safe journeys. It's the confluence of multiple imperfections that result in car accidents (usually) - e.g. Driver 1 steps suddenly on the brakes AND Driver 2 is fiddling with the radio AND it's raining - or whatever, and you get a car accident.

So, yeah, maybe Driver 2 should be able to pass the brake check, but that doesn't mean it is good or safe or desirable for Driver 1 to be randomly brake checking people. Having a car that randomly brakes is like having a driver who randomly applies the brakes - you shouldn't do that, it's bad, and unsafe.