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connect lines to the master, and put the ends of the lines into the masters fluid reservoir. fill the reservoir up.
get a large dowel that fits into the piston center and holding the master, push the piston in. do this till you no longer get air coming out of the lines. it usually takes 8 to 10 pumps.
mount the master on the booster before removing the lines and hooking up the trucks lines. this will make bleeding the trucks lines easier.