ABS Tester

It depends on your model, year. Buy a Chilton or Hayns Manual. You can find the correct way to bleed the braking system.

This may involve using an ABS tester to cycle
the valves in the ABS pump to purge any hidden air.
Bleeding ABS systems is not trivial. The
traditional "pump the pedal, hold it down, open the
bleeder, close the bleeder and pump some more" litany
won't always collect the last bit of air lurking inside
the ABS pump.

-from PM June 04.