Stop in for a cup of coffee

Brakes on honda pilot, left rear caliper seems fine.
Slides are nice,clean and greased.
Compressed caliper in with ease.
Brake pads move easily i the mounts.
Put all back together, pump up brakes and start car.
Give pedal a hard push.
Left wheel stuck. Right one spins.
Loosen brake line, left wheel stuck. Ordered caliper.