Hawk HP+ and EBC Slotted Brake Rotor wear - Opinions

[sgernon]

In March I swapped all my pads and rotors and now am seeing some issues with my rear rotors wearing excessively. Car is a 72 Camaro with C5 calipers all around, C5 front rotors and LS rear. I was running a 1 1/8 master with the front lines split with a T fitting and the rear has an adjustable prop valve that is wide open. I also have hydroboost and had a very touchy brake pedal. I'm now swapping to a 1" master and have reduced the power steering pressure by adding a washer to the valve to try to get some touchyness out of the brakes. The trans is out of the car right now so I can't say what this has changed in the overall feel.

I was running stock rotors and pads without issue for the last year or so. The rear pads were wearing faster than the front but overall it did not seem too different. Before heading to a track day at Thunder Hill in April I swapped to HP + pads all around and DBA slotted front and EBC slotted rear rotors. I was going to use DBA all around but was told there was a quality issue with the LS rear rotors so I chose EBC instead. I've now run a full 5 session day at Thunderhill, ~500 miles of street driving and a autocross day. I bought the pads and rotors on 3/29.

I pulled the wheels off last week and found the front rotors look almost new while the rears are very worn. The right rear rotor is almost worn through the slots and even most strange to me is the fact that it is not eveny worn (see pic). The pads in general look fine and are not worn at all.



I contacted EBC and they were very nice to talk to and responsive. EBC is even nice enough to send me a new set of rotors due to the issue. They say the pad compound is causing the wear which seems reasonable since the pad looks new but also seems odd to me since the fronts run the same pad and the rotors look almost new. I asked them which pad they recomend for the maximum stopping without excessively wearing the rotors. They responsed

"I would recommend our Yellowstuff brake pad for an aggressive friction material that is gentle on rotors. Our Yellowstuff brake pads are made of a ceramic base and feature Kevlar for friction. The reason they are gentle on rotors is because we use no semi metallic metals or fibers in the pads. They have a mild bite during normal street driving and a aggressive bite when the pads heat up, this makes them great for street, track, and aggressive driving.

Here is more information on our Yellowstuff pads-
http://www.ebcbrakes.com/automotive/...00_index.shtml"

Has anyone had similar issues with EBC rotors or using HP+ pads? Any idea why the rotor is wearing uneven?