Question for all. My front disc brakes need changing, the wear indicators have voiced themselves. But the front left disc caliper has started to make a loud pop that you can here as well as feel. Is this because the pads have worn down too far or is this a caliper going bad? I have zero brake experience

_________________
2005 Jeep Liberty, Full Ironman HD lift F/R, JBA 4.5 arms, JBA 1/4" top plate, JBA 10mm trim packer, 245-75-16 Firestone Destination A/T's, 4x4Guard and Tomken skids