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I'll second the pad bedding, as well as rotor burnishing (related). Before you use your breaks aggressively, you need to bed the pads (evenly transfer pad material to the rotors) as well as gradually heat the rotors, then drive for a few miles without touching the breaks to cool the rotors and pads back down. I'd modify the 60-5 mph recommendation by suggesting 5 stops in row from 60-20 with moderate pedal pressure, followed by another 3-5 stops from 75-20 with about 80% brake pressure. You'll know when you've done it enough because the pads will be smoking (you'll smell it) and they will start to exhibit some fade (stopping distance increases with same amount of pedal pressure). After you cool the brakes back down and park it (do not set the emergency brake) you'll see that the rotors will have a bluish gray hue to them near the inner and outer edge and everywhere else should have an even thin layer of brake pad material deposited (dark gray).*
I track mine (lots of hard, threshold braking) so do the above burnishing procedure at minimum every time I change pads and/or rotors. I've never had a problem like you describe. On all my previous cars I haven't ever done a burnishing procedure and never had a problem, but on those vehicles I was really easy on the brakes (coast for a while before even using the brakes, etc).
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