I would: Have the dealer make sure all 4 tires are matched, mounted in the right direction, and within wear tolerance; insist on an alignment; and make sure the caliper pistons are as they should be. If you feel a pulsing in the brake then have them check the ABS. As the brakes are not spongey, my suspicion is alignment...too few miles for the caliper pistons to be shot, but, maybe somebody else has some ideas? Stay on them, that's why you bought CPO...!

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