I've done a bit of research on the net regarding tools which allow an individual to bleed brakes without any help. There are several different methods available.

1. Pressure bleeding: A few pounds of air pressure is applied to the fluid in the master cylinder.

2. Vacuun bleeding: A vacuum is applied to the wheel cylinders to pull brake fluid through the lines.

3. Check valves: These allow fluid and air to leave the wheel cylinder when the brake pedal is depressed, but don't allow air back into the brake system when the pedal is released.

The check valves are only a few dollars, while the pressure and vacuum systems are more expensive. This tool will not see a lot of use in my garage, but decent quality tools are the only kind of tool worth buying.

So, how do the various systems compare and what would you folks recommend?