2005 Chrysler PT Cruiser Repair Question
Rotors and bearings don't make knocking sounds. Bushings could depending on which ones. Common causes are worn ball joints, tie rod ends, struts, upper strut mounts, and anti-sway bar links and bushings. It's helpful to know when and under which conditions the noise occurs. Your best bet is a suspension and steering inspection at a tire and alignment shop. That is normally a part of any alignment.
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