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Brake calipers stick when they get old. You need to replace it and the other side While you're at it.
check brake hoses. check brake fluid condition, if fluid is contaminated or mixed with wrong fluid, calipers can lock-up or stick. check caliper bolts, hardware, caliper brackets. replace if broken, bent, or missing.
check for loose caliper bolts, brake pad may be moving around in caliper or caliper bracket. missing or broken brake hardware.
It would be more cost effective to replace the brake caliper. If you repair the brake caliper it will cost you more in the long run.
brake hose is bad
You either have a bad brake caliper or the brake hose is bad.
If the caliper or brake piston were damaged, that would cause them to stick. Another possibility is that there is too much brake fluid and the relaxed position has the pads has them biting the disc.
Not adjusted properly Parking brake not releasing fully Frozen caliper
A stuck caliper piston. Stuck caliper slide pins. Pinched brake line/hose. Frozen/stuck parking brake cable/mechanism.
My 92 Silverado right front brake sticking why
Most common cause would be a loose brake caliper mounting bolts.
same happened to my 2002 spec..it was the brake pad was cracked in pieces inside..the fragments were jarred against the caliper and rotor plate.... Frozen brake caliper? Misadjusted drum brake Contaminated brake lining