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try a few taps with a hammer & lots of pb blaster. let it sit over night. use a line wrench (special type of wrench) to try and open them. it should work.
if it does NOT work, heat is your friend. thermal coefficient of expansion is almost 2x that of steel. this means that as you heat the caliper, the hole in the caliper will expand faster than the bleed screw. this will loosen things up; your bleed screws should back right out.
when you are done, if you want to be on the safe side, gently run a tap into the bleed hole to clean up the threads. install new bleed screws and replace all of your brake fluid.
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Threaded Mode
