I noticed the pads where not retracting. Couldn't turn rotor with or without bleeder valve opened.

Replaced front pads.
Next day brakes locked up at 45 mph.
Sat on berm for 20 minutes to cool brakes.
Still locked up.
Another 20 minutes later they freed up.

While bleeding the brakes after replacement, I noticed the pads where not retracting. Couldn't turn rotor with or without bleeder valve opened.

I pulled the calipers back off.
Lubricated piston.
Used free-all pressed piston in 3 times.
No issues with piston going in but couldn't tell if that slight retraction was working when releasing brake pedal for sure.
Seamed fine after that.

I then wire brushed all the medal and brackets with a dremmel to remove rust and allow pads to slide freely.
Removed top fluid from reservoir and topped off with new fluid.
I then bled the breaks until I could see the fresh clearer fluid come through.

When replacing passenger side caliper one slider pin wasn't cooperating and I gave it a slight hit with my driver.
Didn't seem like a big deal.
I did not lubricate any slider pins. Could it be that simple? Haven't pulled off tires to check yet.

Booster, master cylinder, pistons, brake lines, fluid levels show no issues. Bolts all torched proper specs. Valves closed and capped. Brakes freely slide (when caliper is not on and compressed of course).

Thoughts?