I have a nice trick to remove the wheel cylinder without breaking the metal brake hose.
1- Pop out both pistons with their dust covers, you won't need it anyway but might be worth keeping them.
2- Remove both 10mm screws at the back of the wheel cylinder
3- Pull slightly on the wheel cylinder so it's separated from the backing plate.
4- Put a long screwdriver through the now empty cylinder
5- hold the brake line tight so it won't budge (10mm wrench or Vise-Grips for a rounded off line)
6- Turn the wheel cylinder using the screwdriver. The key here is to prevent the brake hose from snapping. If you only turn the cylinder and the brake line stays in place, there's no way you'll break this one.
7- Set the line end free with PB blaster and the 10mm wrench.. You can use a propane torch if you want. Once it turns freely again, install the new cylinder.
Of course, you could do this on an old cylinder you would want to keep. However, I don't recommend popping the pistons out if you plan to keep it. Just use a monkey wrench instead of the long screwdriver. You could then try to get that broken bleeder out

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