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I would caution you to be careful with a torch. I heated one too much and it sounded like a pistol shot as the piston flew 50 feet into the woods.
I used a propane torch on my 550 caliper 15 years ago.If you destroy the nipple getting it out, you can still get bleed nipples from many places.I'm going to try heat, and a 6 point socket. My box end failed me badly.
I've been through this a few times. I've got one that I sheared off and just left that way, filled it w/ fluid, put in the pistons and then bled it from the top.
I forgot to mention. Nitric acid will dissolve the bleed nipple but has no efect on aluminumjust in case it all of the above fail.
I also read on this forum that Aluminum Sulphate (Al2(SO4)3) will dissolve the ferrous metals and leave the aluminum in tact. You can pick it up at the depot or other hardware/garden stores. Its used to change the pH of your soil so your hydrangea turn blue. I found this somewhere else, not sure if its true (i hate chemisty) but it looks good:
I've had success with getting the pistons and bleed nipples out of calipers by boiling them in hot water for about 1/2 an hour. Ensure the caliper is covered completely with water, and also don't leave it as water will evaporate so keep add some water to keep it covered if you don't have a deep pot. With the nipple, you can always try to tighten it just a little to help break the seal of the thread and then try and get it out. Penetrine also help/works sometimes. Another combination is 50/50 of diesel and kero. I wouldn't put flame on that though
I had the same problem yesterday and I borrowed one of the cannister types from my neighbor. About 10 seconds on and off on the nipple was enough to get it loose.