In theory In theory, you should, of course, brake optimal in an emergency situation: in that case, you have the shortest possible braking distance, and that's exactly what is needed.
But in practice, that's hard to achieve at a moment where panic comes around the corner.
The danger is that you, next to squeeze the front brake (which is perfect if you do it like squeezing a lemon, and not all in once), also will slam the rear brake, and hold on to it, which is not ok.
Pull the clutch and use the front brake For a real emergency stop, you can better leave the rear brake for what it is, and only use the front brake. On top of that, you pull the clutch.
Why no rear brake? It is very difficult not to slam the rear brake in an emergency situation, and especially to let the rear brake go in time. If your muscles get tense in such a situation, the tendency is to push the rear brake hard with your foot.
That will result in a locked rear wheel. If you are lucky, it will slide from left to right and back, and if you are less lucky, the rear wheel will move passed the front wheel.
In an emergency situation, you don't want that.
That's the reason for the advice not to touch the rear brake in an emergency stop.
As a bonus, the bike will stay upright, because the rear wheel will keep turning. A turning wheel has resistance to move sideways.
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