1982 Delta 88 Royale

I keep my car well maintained, thought I had a brake problem(everytime I hit the brakes squeaks really bad) so I went to have them changed, come to find out the brakes are perfectly fine.

What else could it be??

 

There are some little clips mounted on the brakes that indicate worn pads, if they are installed incorrectly or damage they can squeak as if the pads are worn down. Have someone else check the brakes for that.
BTW, welcome to the site.