Quote:
Originally Posted by Gforce
Most likely caused by the pads moving around slightly and touching the no wear ridges at the outer and inner limits of the pads as they wear the rotor. Modern asbestos free brake pads wear rotors quite aggressively. I note that the rotor surface rusts quite quickly if you do not drive regularly. That causes the rotors to wear a little faster then if you drive regularly. Rust can also make noise but only for the first brake application or two after the car has sat for a few days. Not likely your front brakes are worn out just yet even if you drive like a maniac, these are light cars with big front brakes for their size.
Rotors are designed to last only for about one set of pads with a bit of extra thickness to allow for variation in braking habits.
Seizing calipers make a knocking sound and you can feel the rotor runout through the brake pedal as well. It is unlikely your calipers are seizing at this young age.
I recommend you brake harder than you are accustomed to, at least a few times a month. This will help reduce brake noises
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The surface on cast rotors shows surface rust very quickly. That rust has zero effect on the wear or life of a rotor. None. Zip.
Rotors for some cars are indeed small and light enough they should be replace with each set of pads. Ours are not those. You should easily get 3 sets of pads or more out of a set during normal driving.