Bleeding Brakes! Why do you need to do it?

Sometimes, for one reason or another, air gets into the cylinder or the pipework. I guess this is most common when some sort of maintenance has been done. It has to be the sort of job that causes brake fluid to be spilled.

When air gets in the system the hydraulic system won't work so good, or maybe it won't work at all.

When you press down on the brake pedal, it feels soft and easy to push. That is because the air just gets squashed up instead of the brake pads being pushed against the disks. You have to refill the system and make sure that all of the air has gone out of the system.The brakes will work fine again after that (usually!)