Practice
I'll endorse the comment above about finding a stretch of deserted road and practice braking hard. Keep applying more pressure until you have a feel for when each wheel will lock. Then go back and repeat in wet weather. Then go back again when you get a different bike, etc.
It is great to know the theory of emergency braking, but when the moment arrives you will forget everything. If you have time to think about what you are doing, it's not a real emergency. That is when all that practice turns into instinct. You will (well, should) do the right thing instinctively.
None of this should replace total concentration and anticipation to avoid needing to stop in an emergency.
A wise man (who was teaching me to ride a motorcycle at the time) told me "with perfect anticipation all the time you will never be faced with an unexpected hazard, and will never have to perform an emergency stop. Such total concentration all the time is not possible for humans, so learn it".
I've proved the second part right so often now...
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