I agree with ShortysTRM. I let my front brakes go too long a while back and the exposed slides got rust and dirt on them. When the caliper went back in with the new pad thickness, that crap would cause it to creak as it slid in and out. It would then pop as I released the pressure on the pedal. Pissed me off until I asked a mechanic. Just pull your calipers off, and clean/grease the slide pins. Easy fix. If you let it go, you will put grooves in the slide pins and you'll have to replace them. Also run the caliper piston out and make sure there is no rust on that either. That can cause the creaking also. Since u got a 99, it might be worth it to get a caliper rebuild kit and service them completely.
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