Answer : 90% of the people who experience this sound are owners of brand new Electric bicycles or at least brand new Brake Pads. Heres what happens when the brakes are new there is a thin layer of oxide coating/oily stuff to prevent rust or to simply lubricate. This is the thin flim of god knows what that causes your electric scooter to squeal like a piglet.
The solution to this problem is simple. Brake hard during the first days of owning the bike. This is a period everyone likes to be careful...avoid dropping the bike and fearful to overheat and busting the motors from over ramming. Women who have husbands and bfs who owns vehicles can always remember the feeling of seeing your man being more sensitive and gentle to his ride than he ever did to you. Brake hard and fiction will peel away that stuff that causes the sound and with it goes that squeal.
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