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Take this with a grain of salt but I replaced my C7 Z51 Brembro pads at 10k miles with the Z26 pads. Starting at around 15k miles I would get a pulsation (steering wheel would shake left to right) when I braked and it felt like warped rotors. After doing a hard stop it would go away but it kept coming back. I'm not sure if it was build up on the rotors or what but I didn't like it. I did a proper bedding of the brake pads when i installed them but for some reason they didn't like my car. I thought about replacing the Brembos on my 22 ZL1 but decided I'm just going to live with the brake dust. About a month before I sold the car I had it serviced and the shop told me the rotors were starting to get a little runout on them.
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