It will depend on your brother's DUI history, failures to appear, etc. He needs to contact an attorney as soon as possible to have a bond motion filed.
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For Failure to submit to be a criminal charge, it means that your brother has a prior refusal. Does he have prior DUIs? It will affect his maximum sentence on this DUI if he has priors. Your bother needs an attorney ASAP.
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Refusing a breath test with a prior refusal is punishable by up to a year in jail. Depending on what happened when he was originally arrested, he may have a legal argument to prevent his prosecution. I would encourage the family to hire an experienced DUI lawyer on his behalf. I would also recommend he put some thought into seeking counseling.
Posting an answer to your question does not create an attorney / client relationship such that you can or should rely on the information provided herein to take action. Instead, it is intended to simply provide you with information. I am not your lawyer and cannot provide you with legal advice unless and until I am hired to do so.