To tighten the brakes on your Rad Power Bike, follow these steps: Locate the brake adjustment barrel: On the brake lever, you should see a small barrel-shaped adjuster where the cable enters the brake lever. This is called the brake adjustment barrel. Tighten the brake adjustment barrel: Use your fingers to turn the brake adjustment barrel clockwise until the brake pads start to touch the rim of the wheel. Test the brakes: Squeeze the brake lever to check the tightness of the brake. The brake pads should grip the rim of the wheel without slipping. Fine-tune the adjustment: If the brake is too tight, use your fingers to turn the brake adjustment barrel counterclockwise until the brake pads stop rubbing against the rim. If the brake is too loose, turn the brake adjustment barrel clockwise until the brake pads grip the rim firmly. Repeat for the other brake: Repeat the same process for the other brake. Test ride: Take your bike for a test ride and apply the brakes several times to ensure they are working properly. If you are unsure about how to adjust your bike's brakes, it's always a good idea to consult with a professional bike mechanic.