warped rotors...this happens from heating up your brakes, and then sitting at the lights with your foot on the brake pedal...the caliper clamps the rotor and squishes them out of shape as they cool down...
some people say that you can half fix it heat them up in some twistys with lots of hard braking, and the action of them passing through the calipers while they are clamping the heated rotors sorta makes them even (ish) again. Otherwise you could just view this as a damn good excuse to get some nice slotted replacements
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