1985 VF500F brake squeaking

Hey guys, my VF500F has recently started making some noise when I stop. It's kind of metallic and not continuous (as in, *squeak**squeak**squeak*, not *squeeeeak*), and only happens under light to moderate braking with the front brakes. I've got plenty of pad left, the rotors are in good shape, and the system has been bled pretty recently (last 1500 miles or so).
I noticed that the caliper on the left (so the side with the TRAC system weirdness) has a little bit of free play forwards and backwards, and a tiiiiny amount to the sides (as compared to the other side, which is 100% solid). Is this what's making my weird noise? If so, what kind of repair am I looking at? Thanks!

 

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The freeplay on the TRAC mechanism is normaL

Try cleaning and regreasing your caliper slider pins, and make sure your brake pistons are moving easily in and out.