He has told you completely backwards. You want to lift the caliper higher than the master cylinder. That way gravity is on your side. Get at least 3 feet of clear hose to fit the bleed nipple and drape over the rear fender. A vacuum bleeder is good just to catch the fluid. Again keep gravity working for you, this gets the fluid above everything. Pump the m/c until it starts up the hose. Burp the banjo bolt at the m/c to release trapped air. Be patient. Are you sure you have fixed the pistons?