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Brakes have nothing to do with mileage, if all the driving you did was highway then you might never have to replace your brakes, other than inspections and resurfacing. But in the city, you might be doing the front brakes every 10k.
Spark plugs are supposedly good for 100k on newer cars, doesn't mean they always will last that long tho. But you're not going to cause any damage by not replacing them early, its not preventative maintenance like fluids and filters.
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