Having the torch sideways and moving it around the bleeder I have not had any problems overheating cups. It doesn't take long to heat those pissant small bleeders up. That is part of the problem, especially on the brake cyl. vs. calipers, the bleeders are so small and hollow they break quite...
You don't heat up the caliper or wheel cylinder too much when you heat up the bleeder. I know how uneven heat can crack cast iron. You can shield the metal also.
I do have to try the atf mixture. I think I read a recipe that had kerosene in it also and maybe one other ingredient. Thrust...
Love never-seize even if it does tend to make a mess.
Heat frozen bolts, nuts, brake bleeders to light red hot and quench with squirt water bottle. If it does not come loose do it again. Works like magic.
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