Gears and brakes are two completely independent components. Gear failure (such as gear getting stuck) will not cause brake damage. Conversely, having a problem with the brake will not directly cause gear damage.
All products on our official website come with a 12-month warranty. If you purchase a product that has a problem within one year, we will be responsible for you. Here is the link: https://www.vevor.com/pages/return-policy.