The best way to reduce police brutality is to obey the police.
The amount of people who screams "my rights" or "police should be trained to not use deadly force" forget one thing: policemen are also people whose first instinct is to survive.
Honestly, If you're guilty, I don't Care what happens to you If you disobey the police. You could steal just a gum, If you run or don't surrender when ordered you deserve everything that might happen to you.
Now, If you're innocent and the police is not being corrupt, you still must obey every command because the police is investigating a crime and most likely only have broad descriptions to follow. What are they supposed to do? Not go after suspects? Yes, It sucks, but they must do proper investigation.
And If they are being corrupt, aside from signing a false confession, you still comply every other command. If they are being evil, all they need os the littlest excuse to fuck you up, so obey, Go to the police station get in contact with a lawyer or family member and only then you try to seek justice. Throwing a tanturn while being falsely arrested Will only harm you more.