If the hydraulic disc brakes on your bike are feeling spongy at the lever, then it’s normally a sign that the system has taken in some air. Unlike the incompressible fluid in your brake lines, the unwanted air bubbles are a compressible gas and will cause excessive movement at the lever and dramatically reduce braking performance.
Bleeding the hydraulic disc brakes of your bike may not necessarily need to be part of your routine maintenance but it’s a fairly simple procedure and one that you shouldn’t be intimidated by.
Shimano hydraulic disc brakes are some of the most popular on the market and are also some of the nicest to work on. Follow our video above for a step-by-step guide on how to bleed your Shimano stoppers: