Uneven pad wear, I need your help

[WhitePonyRTR]

I am having trouble diagnosing and fixing uneven rear brake pad wear. The inside pads wear even but the outside pads only make contact on the top half of the rotors. See the photos below.……. I have taken everything apart twice and put back together at proper torque and still am not having any luck making full contact. Steps taken so far……remove rear caliper, remove caliper bracket, remove guide pins, clean and clean guide pin holes, re-lube guide pins with sly-glide brake lube. Clean caliper bracket and pad clips with brake clean and wire brush. Retract piston fully, reassemble and torque everything to factory specs. Caliper floats easily on pins and doesn’t bind. Flat edge on rotor shows they are flat and not miss-shaped…..Pads float freely in clips and show no sign of binding…….please help, anyone got any ideas?
Car has 14k miles.
The factory pads used to wear evenly, I changed out to G-loc R8 race pads for track day 4 weeks ago, drove for ~250miles and they wore like this, I had some family stuff come up and did not run on the track, the R8’s were too loud and dusty for street driving, so purchased the G-loc street pads and placed in the car, the Street pads wear the same way, 500 miles later they are still wearing unevenly, took apart again this week and reassembled after torquing and they still wearing unevenly this way.

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[robvas]

Is there a pin/tab on the piston that is not allowing the pad to sit flush because of the orientation?

 

[Swtbabybilly]

Try also putting grease on the contact spots where the pads sit on the clips in the bracket helps them slide back and forth also check the piston in the brake caliper they sometimes develop a rust ring that prevents them from fully going out or back after braking if thats the case you can replace the caliper or you can remove the piston from the caliper sand it with some very fine sand paper then re install im sure you can find a video on youtube on how to do this even tho im sure some people will jump on here saying you shouldnt do that but if you do it rite and get it sealed again rite its not an issue good luck man

 

[Craig Brown]

Did you use a dial indicator on your rotors to make sure they are within the .002 to .005 of true? Did you clean the mating surfaces of the hub and rotor? Make sure the hub surface is clean and free of rust. Put just the rotor on the hub using three lug nuts and rotate it while the dial indicator is touching the outer surface, you shouldn't have any more deviation than .005. If you do remove the rotor and rotate it, one stud hole and try it again. With a marker, mark one stud and put a mark on the rotor at the same spot so you don't lose your place while doing the rotating. Again, make sure that the hub is 100 percent clean before you start. Are all four rotors showing this same ware?

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