How do you change a rear brake on a Yamaha pw50?

To change the rear brake on a Yamaha PW50, first, remove the rear wheel by loosening the axle nut and sliding the wheel off. Next, take out the brake drum by unscrewing the retaining screws and detach the old brake shoes. Replace them with new shoes, ensuring they are positioned correctly, then reassemble the drum and wheel. Finally, adjust the brake lever for proper tension and test the brakes before riding.