The stock brake pads have wear indicator shims that squeal when they wear down past minimum acceptable limits.  This is usually the first signs that tell you to swap out the brake pads.  When replacing brake pads, be aware to keep the brake pads and brake rotor as oil/grease free as possible.  Having a can of (spray) brake cleaner is always good to have nearby when touching the brakes.  To aid in break-in, some people recommend to bevel the leading and trailing ends of the brake pad with a file.  Keep the brake pad mating surfaces are clean as possible, as dirt and oil can seriously degrade break-in and brake performance.

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