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How much fuel does brake pads dragging waste?
I was doing a brake job the other day and I noticed that the brake rotors are much easier to turn with the pads and calipers off than on. That started me thinking that if the pads were somehow spring loaded so they fully retract and do not rub on the rotor when not using them, that would reduce drag and extend pad life. Would it not? I must be missing something. If that would save fuel, why do car companies not do it from the factory?
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