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Steel brakes should not make noise if they are working properly (as opposed to ceramic brakes, where noise in high humidity situations occurs because of the materials) When steel brakes make noise, it's because the calipers are vibrating due to a number of reasons. It could be an uneven pattern on the brake disc, the pad material, or because of the expansion/contraction of the pad/disc material causes some kind of harmonic resonance in the caliper. Usually you can solve this with some caliper grease, or a change in the pad material. You can apply caliper grease yourself, but make sure you don't get any near the pad. If that doesn't solve the problem, then it's got to be a structural problem with the caliper or disc.
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