#19771, "RE: HELP PLEEEASE ASAP" In response to In response to 0
What conditions were the guide pins in?
It sounds like the guide pins and/or the holes they go into are rusted and the pins seized. Rather than the caliper sliding on the pins clamping both pads to the rotor the caliper piston is just pushing the inside pad against the rotor.
Clean out the guide pin holes, get new guide and lock pins, and grease them well.