Since the brake system is filled with fluid, it must be occasionally "bled" or the old fluid released in order to install new fluid. It is also occasionally necessary to remove air bubbles that get into the system if any of the parts are changed. Disc brakes, drum brakes and all hydraulic brakes have bleeder valves next to the slave pistons. These are opened when the system is being bled and brake fluid flows out as well as air bubbles. When the brake fluid is coming out without any air bubbles, the mechanic seals the bleeder valve and tops off the brake fluid reservoir. Bleeder valves can also be found on the side of the reservoir. These are used for the same purpose; getting air bubbles out of the master cylinder assembly. If you have air bubbles in your fluid, your pedal will feel softer than normal, and braking power will be reduced, so it is a good idea to have your brakes bled and the fluid changed according to your owner's manual.
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