I wore out approximately 1/10 inch on a pair of new Bendix brake pads unevenly after driving 20 miles. I rechecked alignment on my rotors and wheels. Everything looks OK, but didn't realize that one of my retractable pistons inside my brake caliper bracket was welded with rust, which cause the outer pads to wear uneven and the inner pads to wear quickly. That's right, THE CALPER BRACKET. This was on both wheels. I had to verify with my friends LS to see if it's an isolated problem with just my car. He had 1 bad on his car and didn't know it. He had NO inner pad left and was breaking with just medal on medal. To see if you rear caliper bracket is bad, just look at your inner brake pads.

I change mines out and it rides and brakes like a new car again. And thanks to Advance Auto Part in exchanging my brake pads, although it was my fault.

Are you talking about the actual caliper piston or the two caliper bracket slide pins that hold the caliper to the bracket? I was just painting my calipers the other day and took the RR bracket off... one of the pins was frozen and had to heat it with a torch to remove it. Found a small crack in the boot that allowed the crud to creep in and rust it up. I didn't have a wire brush to clean out the pin hole on the bracket so I drilled the crud out of it with a bit. I wire wheeled the slider pin, installed a new boot and white lith grease and good to go... but you gotta check those slider pins!!!!

and this is all normal..........

and this is all normal..........
... for the LS :D