Once a Will is filed with the Probate Court, it is an open record. Thus, your brother could review the Will at the Probate Court or hire an attorney to do so.
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Yes, its an available record. Your brother is an interested party so he is entitled to notice even though not named in the will (that's the law in almost every state). Does the will have weight? Of course, that's why you have one. Can he contest it anyway? Of course, but doesn't mean he has a leg to stand on. You should be represented by counsel if you expect an issue.
This is not legal advice nor intended to create an attorney-client relationship. The information provided here is informational in nature only. This attorney may not be licensed in the jurisdiction which you have a question about so the answer could be only general in nature. Visit Steve Zelinger's website: http://www.stevenzelinger.com/