A passenger may enter Brazil with a valid visa in an expired passport provided
-The page which contains the valid visa in the expired passport has not been invalidated or mutilated in a manner as to make visa illegible.
-The passenger holds also a valid passport of the same nationality.
-a handwritten annotation does not appear in the passport that passenger has been advised to obtain a new visa in a valid passport
****In All Cases Transfer Of A Valid Visa To A Valid Passport Is Highly Recommended.

Also please keep in mind various airlines may have their own SOP and may interpret the rules differently on the day of the flight. If you have the time before your next flight it is better to transfer the visa.