After changing my set summer wheels (Ixion 18") and Michelin Pilot Sport tires over to my set of winter wheels (Ixion 18") and Michelin Pilot Alpin tires (balanced last winter, with Hunter Road Force Balancing, but rotated front/rear this time), I noticed vibration in the brake pedal when applying the brakes over 65 mph. No such vibration existed last winter, and no vibration existed before the winter tires/wheels were put on the car (23K miles). No damage seen to the wheels or tires, no vibration at slower speeds, no vibration under acceleration or cruising, no vibration in the steering wheel, no inflation problems, and no pull to either side under accelerate or braking. Dealer suggests it might be a tire balancing issue or a rear brake pad/rotor issue. I have an appointment on Tuesday morning to have thing checked out.