Although disc brakes are popular mainly because of their low maintenance, occasional upkeep is necessary. If your hydraulic disc brakes feel spongy or the lever can be pulled right to the handlebars on longer downhill runs, it's high time to bleed them. Bleeding kits contain everything you need for this. But be careful: when it comes to brake fluid, there are often differences from manufacturer to manufacturer, and certain fluids aren't compatible with certain brakes. Brakes are one of the most important parts of a bike, so if you're not familiar with them, it's better to leave the job to a professional. In this category, you'll also find spare parts such as brake disc screws, fluid, adaptors, cable ends and more.