First thing you need to do is bench bleed the new master cylinder.new master should have come with 2 plastic tubes and fittings.screw fittings into new master,fix tubes to fittings other end in to top of master where fluid goes.fill with fluid make sure the tubes are submergered in brake fluid for entire process.take a screwdriver and press plunger in rear of master.use short slow strokes to start you will see air bubbles in resovoir.slowly increase length of stoke watchin resovoir till no mome bubbles.now ready to install.Remove failed master,(loosen lines befofe removing mounting bolts)remove lines last.reinstall new master then remove bleeding tubes last install and tighten lines.Fill fluid replace lid,have a helper sit in car,loosen lines about half a turn.Have helper depress brake pedal slowly and hold down pedal untill lines tightened.when tight release pedal and repeat 5/6 times.fluid should come out of lines without any air when bled propperly.if failed master did not run out of fluid uyou should be finished.if pedal still soft/mushy will have to bleed a wheels also.use same proceedure but openening bleed screws not lines.may take many times to get rid of all air,you can see and hear the air exiting bleeders.keep an eye on fluid level while bleeding if u run out you are starting again
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