Dave

usually on these things the bleeder port is not located on the very top of the caliper when installed on the car. If they are not you will leave a lot of air in there with regular bleeding . To make it easier we usually take the caliper off of the car, find a piece of wood to stick in the caliper between the pistons to keep from blowing the pistons all the way out. Hold the bleeder screw straight up and down, have someone to pump the brakes and loosen the bleeder to bleed out the air. Keep master cylinder full at all times. Do front brake first. Gravity will not work if bleeders are in the wrong place.

Some drivers like a little faster brake if you do go buy the next larger master cylinder
(piston size), that will speed things up.

Honest Dad himself