Q:

Why does my car shake when I go over 45 mph?

A:

Common causes of cars shaking over 45 mph can include misalignment of the wheels, bad wheel bearings and warped brake rotors. If your car is shaking at relatively low speeds, it's best to consult a mechanic .

Common causes of car shake include:

  1. Misalignment: When tires are misaligned, they can cause many problems, such as uneven tire wear, steering issues and shaking. If the tires are not all balanced, some will wobble as they rotate causing the rest of the car to shake.
  2. Brake Rotors: When brake rotors become warped, they shake the wheels as they rotate. This is most noticeable when stopping, and as brakes are applied, the car will shake harder.
  3. Wheel Bearing Failure: The wheel bearing is located inside the wheel hubs of cars and are what spin the wheel. When they fail, they cause the wheel to wobble and make a loud whirring noise that gets higher as the car goes faster. The more worn they become, the louder and harder they wobble, causing the car to shake.
  4. Engine Mounts: Engine mounts hold the engine in place, and when they begin to fail, the rubber inserts that handle the engine's vibrations fail as well. This will then cause the car itself to vibrate.

Sources:

  1. oreillyauto.com

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