If you have an air compressor this brake bleeder makes great sense. It is inexpensive for such a well made tool and allows you to bleed two callipers at once. As with all vacuum bleeders it helps to wrap the threads of the bleed nipples with to prevent air being drawn past the threads.

You can then connect the air line to the tool and connect the two pipes to the bleed nipples of the callipers, press the trigger and lock it on, and when you open the bleed nipples fluid and air, if present, will be forced out of the pipes and you will be able to see you are clear of air. Always keep an eye on the fluid level in the reservoir and top it up as necessary.

Pneumatic brake bleeders are the easiest way to bleed brakes and empty systems when doing a strip down