Practice question

A vehicle has a noticeable brake pedal pulsation (pushing back and forth) only when applying the brakes. What is the most likely cause?

An out-of-round rear brake drum, or a disc rotor with excessive thickness variation
The brake booster is leaking air internally
The brake pads are contaminated with grease or oil
Air is trapped in the master cylinder secondary bore

Answer: A — An out-of-round rear brake drum, or a disc rotor with excessive thickness variation

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