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If you aren't able to bleed that, most likely the system has a lot of air in it and is causing the problem and if there is a leak, it needs fixed.
Confirm there is no leak or it is repaired. Then we have two choices, replace the caliper with the stuck bleeder, or work at getting it opened.
When I have one that won't open, I first take a wire brush all around it to remove any corrosion, dirt, rust. Then spray it with a good penetrating oil and let it work at it. See if that helps.
Let me know.
Joe
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Wednesday, March 10th, 2021 AT 11:00 AM