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I would stick with gravity as a recommendation, if you have no pressure bleeder. Pumping the pedal can easily get you into the scratch-it zone and you'll be looking for a new master.
The accounts of stuck rear caliper pistons match the experience I have in my fleet. The quality of the rebuilds available seems to be so unpredictable, I dread the whole replacement process.
If you do submerge your bleed hose in a container, tie it with a weight, and gob up the bleeder screw threads with heavy grease to seal them, if you have any thoughts toward "helping" the gravity process with a pump on the pedal.
Some time ago I also noticed the similarity of the grease gun's tapered thread to the M10x1 brake line nut thread. And if you do rebuild your old ones, the question about how to clean out the grease is a good question. I guess the final cleaning is the most important answer, and that is how I can waste a quart of 91% isopropyl. It is a tough decision between the mess of rebuilding your own and gamble of getting a commercially rebuilt unit worth installing.
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Art Benstein near Baltimore
"Everybody's got to believe in something. I believe I'll have another beer." (W. C. Fields)
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