The owner's manual won't talk about that.
http://www.schwinnbikes.com/support/owners-manuals
If it's Shimano, go to http://techdocs.shimano.com/techdocs/index.jsp and find it.
What's wrong with the brake? Usually pads wear out (replaceable) or adjustments are necessary. I've had bikes for over twenty years and never replaced a whole brake for failure.
Use a search engine for video answers. "replace bicycle front brake caliper", for example.
http://www.parktool.com/blog/repair-help/sidepull-brake-service
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