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The car will vibrate a little more on cold days or when the car hasn't been driven in a while and has been parked somewhere cool. This is because the engine revs slightly higher in order to warm up the engine faster, especially during a cold start in cold weather.

The squealing brakes... Does your husband drive more aggressively and brake more aggressively than you? If the brakes are slammed on or enough pressure is placed on the brake pedal during moderate to high speeds, the traction brakes (actual brake pads) may be activated in addition to the regen braking (engine braking which converts energy and stores it into your traction battery) in order to slow the car down faster. Also, the faster you are going and the more you brake to slow down, the louder the high pitched whirring will sound since this is the noise the electrical motors make when they spin in reverse to convert the kinetic energy into power for your traction battery. This is most noticable when going down a steep hill at a moderate to fast pace and then stepping on your brakes to slow down even more.

It's hard to tell what the circumstances were or what the driving conditions were. It's possible that the vibration felt when braking could also be attributed to the car thinking your husband was panic braking and the car activated ABS to pulse the brakes so that the car wouldn't skid due to the brakes locking up. Another reason could be you went through a car wash, or sprayed water on your wheels, or drove through a puddle and got water on your rotors, which could cause some vibration and noise when braking suddenly.
 
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