Brake problem

Your caliper is either frozen or the brake hose has collapsed and isn't letting the fluid go back like it should. If you replace the brake hose then do all of them, both fronts and usually one in the back.

You really can't see a collapsed hose, it 's just fromexperience that it happens. If the caliper is frozen the piston will not move, so if you put a clamp on the pad to push it back in it won't go anywhere. You'll need to rebuild the caliper or get a rebuilt one. Also check for rust on the caliper slider. That will do it as well.