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Not much. The parking brake operates on the rear wheels only and places the brake shoes (or brake pads on cars with rear disc brakes) against the brake drums (rotors) so that the car will not coast away on its own.
In any case, if you drive with the parking brake on, the shoes or pads will wear a tiny bit until they are no longer in contact with the drums/rotors. you will lose a 32'nd inch or so of brake pad, and that's it.
Rear brake will drag and overheat Fuel mileage will decrease Brakes will "fade" and not be as effective when trying to stop Unnessary Increased wear on brake linings
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