I believe “spec” for this bolt is either 80 or 85 lb-ft.
Generally speaking, that sounds about right for a bolt with a 17mm head. I take it that you have determined that the sliders and piston/s are free? Oh, now I remember what it is that I keep forgetting to mention! Put something out of the ordinary on the drivers seat now. That will remind you to pump that brake pedal till it gets hard before you try to move the vehicle!
85 ft lbs is for the 2 caliper mounting bracket bolts specs.
The slider caliper bolt is probably about 25-30 Ft LBS.
Any tech just tightens with a six inch long combo wrench tight by hand and gves it a little palm bump pushing it probably a little over spec.. Goot and tight is what we call it.
It seems someone overtightened yours with an upper end impact gun.
There is a heck of a difference between a $39 dollar Taiwan impact gun and $500 Snap-On brand one.
Did you get new sliders and bolts?
Do you know what a stretched bolt looks like? Google it.