2006 Silverado 1500 Front Right brake locked up

[Chevy2006]

Driving my truck and started noticing a pull in the brakes thought it was from the back brakes.

As, the back brakes are drum and have never been changed there is over 240,000 miles on the truck.

This weekend I changed the back brakes. to find this was not the problem.

Drove it around testing the brakes, as driving noticed it would start slowing down and I was not touching the brake pedal.

Got home checked out the brakes see if I had done something wrong, this being the first time working on Drum Brakes.

Both brakes turn out to be fine.

Removed the Front brakes and found the right side brake was locked down and not moving.

Was able to release.

Caliper seemed to be working correctly, put all back together same issues.

Changed out Caliper, problem not solved. Changed out the Hose to the Caliper; not solved.

Did a diognose check at Auto part store showed as Left Speed sensor, but was told this would not be the problem, I also didn't want to waste the $80.

So, just looking for some help.

Thanks.