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Like someone said above its because your rear tires are new so there diameter is bigger than the front, this causes a speed differential between the front and rear tires, but also, when you go around a corner the outside wheels will need to spin faster than the inside and this could cause the ABS/Stability system to act up because you've exceeded it's maximum speed differential between all the wheels. Get all 4 tires within 2% of each others total diameter and you should be fine. It might only be a small total difference in height - say 1/8" - 3/16 to cause it act up. And also the new tires will be greasy as others have said which could be contributing to the problem.
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