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Charles, When I have put on master cylinders I made some bleeder hoses, (some rebuilt and new master cylinders come with them). To make the hoses I get fittings to match the MC and have about 3 inches of solid line on them, with about 8 inches of extra rubber tubing extended beyond that. To bleed I bolt the MC into place, attach my lines, and fill the reservoir while elevating the lines. Then I stick the ends of the rubber hoses into the MC reservoir and have someone pump the brakes, when the bubbles stop the air is out. I then connect the regular lines to the MC. To get the air out of any remaining lines I bleed the system at the bleeder valves on the cylinders. Pump up the brakes, loosen the valve while the brakes is being held down (this forces the air out), retighten and release the pedal. Continue the process until the cylinder is bled, then do the others. I've never had any luck bleeding air by pumping the brakes with the reservoir cap off. I have managed to get air in my lines by using that method. I have heard of some that will pump their brakes, then remove the lid with the pedal held down, replace the lid, then release the pedal. The air is supposed to be displaced by the fluid in the system and makes its way back to the MC, and when the lid is removed it escapes. I've never personally used this method, so I am unsure how dependable it is.
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