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deep grooves in rotor/brake pads


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So I removed my front calipers today to rebuild them, as the car was pulling right under braking (I assumed my right brakes were clamping harder). Alas, when i removed the left caliper, I saw a groove about .3cm deep and .5 cm wide in the rotor and both pads. This explains why my brakes were acting weird, but what could have caused it? My pads have plenty of wear left in them. It looks to me as if the pad clip was scraping on the rotor, but what would explain the groove on both pads? On the bright side, the right brakes looked great. thanks.

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I had initially thought that something had perhaps gotten in between the rotor and pad, but the grooves are symmetrical on both pads and opposite sides of the rotor. I guess it could have been a hard spot on the pad, but why would it leave a groove on the pad as well. Im fine with replacing the rotor and pad, I just don't want a repeat incident.

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