You missed to inform some information. I assume that your brother was accused of committing a crime, but you did not explain about his charge.
Under the law, police have a right to detain your brother for 48 hours, then he will be transferred to a prison, and further detained under the power of the court.
In other words, you can bail your brother from the police within the first 48 hours. After which, you have to bail your brother from the court.
If the application for bailment is rejected, you have a right to submit a new application right away. There is no time limit that you have to wait in submitting a new application for bailment.
In case you need to submit a new application for bailment, it is advised that you should increase the amount of the guarantee for bailment, which sometimes, it works.