Brakes will need bleeding every now and then to make sure they are still functioning properly.
This is very important if you take part in competitive events as you'd obviously want to improve your bike's performance as much as possible. Bleeding brakes is a relatively easy task which can be carried out with just a few simple tools.
Firstly clean around the brake fluid reservoir to prevent any muck getting in the brake lines.
Check the manual for the correct measurements (usually dot 4) and then top up the reservoir with brake fluid. Now you can use an open ended spanner to loosen the nipple on the front brake calliper and drain the old fluid into a container.
Pump the brakes a few times until the lever goes soft and the new brake fluid starts to come through.
Then tighten up the nipple again and repeat on the rear brakes. Top up the reservoir again to around three quarters full.