It’s a used vehicle purchased not too long ago, in overall exceptionally good shape — it wasn’t MY lack of proper maint, and not really even the prev. / orig. owner, as the maint. records look good: It was just some gorilla in a shop, as other have noted...
BTW, “ALL”,the main bolts that attach the entire caliper assy. to the vehicle are locked too: Had thought of removing the entire assy. to get better access to the caliper pins, but, no such luck.
“BTW, ALL,the main bolts that attach the entire caliper assy. to the vehicle are locked too: Had thought of removing the entire assy. to get better access to the caliper pins, but, no such luck.”
I recommend removing it anyway. It’s how I remember doing it. And don’t use a flame under a car unless you are absolutely sure you can do it safely.
As for what you’re attempting: use a pick or sharp pointed chisel to scrape away any corrosion, dirt at the base of the heads, clearing a path for the penetrant to get to the threads. Good luck