My brother signed a lease with 2 other roomates. One roommate is not paying for any bills, including rent, and doing things that he doesn't approve of in his house (I won't get into that) Basically, does he and his other roommate have the right to kick the other roommate out? I told him he needs to just call his landlord and tell him what's going on and to pursue finding a different roommate. He is afraid that there will be stipulations against him because all 3 signed the lease. He doesn't know if "bad" roommate would be sued for breaking the lease, or if it would fall back on all 3 of them.

Please help ASAP!

Thank you.

He can be evicted through the legal procedure. Talk to the landlord. What state do you live in?
What would fall back on them is that they would then have to divide the rent and utilities two ways instead of three or get a new roommate.
Since he signed the lease he may be responsible for still paying something depending on what the lease says.