If you don't already know how to bleed brakes, this will make it easy for you. Changing the brake fluid on your bike is a simple, but important part of bike maintenance that should be done regularly.
Over time brake fluid absorbs moisture and air which degrades the brake fluid, resulting in decreased stopping power. You can recognize when your brakes need bleeding by the 'spongy' feeling you get when applying the brakes. When they are working properly, they should feel sharp and responsive.
It's very important you keep topping up the reservoir never allowing air to get in the lines.
And there you have it! How to bleed brakes in 4 easy steps... any backyard mechanic can do it. The process is the same for your rear brake line.
Here's a couple of extra tips to keep in mind: