Will raikou break out if you use a master ball?

Probaby so.Usually a master ball captures Pokemon with no problem...but soemtimes if the Pokemon's strong enough, it can and will try to break free.

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You are wrong NOTHING breaks out of a Master Ball. THAT is why it is a MASTER BALL. You can use it on anything and it will catch it... it is the SURE capture Ball. That is why there is only ONE you can get in the story and the others are mega hard to get. (IE getting one through the Lottery.) And that is why you save it for something that is hard to catch like (in the original games) Mewtwo.

BTW Pokemon MAY TRY to break free but they won't.