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i feel dumb for having to ask, but does the ex have rear disks or drums? if you've been out braking hard and having fun and stuff, and your brakes are really hot, you can warp them when you stop. if they're super hot and you stop and hold the pad against them for any length of time, different areas will cool at different rates, and that can warp rotors. using the parking brake on really hot back rotors is especially bad. just a thought that might help you out a little
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