Practice question

A vehicle has a noticeable brake pedal pulsation during highway braking. What is the most likely cause?

  1. An out-of-balance tire
  2. Air bubbles in the brake fluid lines
  3. Excessive rotor thickness variation or warped brake rotors
  4. A failed brake booster diaphragm

Answer: C — Excessive rotor thickness variation or warped brake rotors

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