This topic contains advice for dealing with some common problems that can arise when deleting resources:
If the deployment step fails because the broker has already been deleted using the mqsideletebroker command, or it is otherwise unable to respond, remove all references to the broker from the Configuration Manager repository. You can do this by removing the broker from the topology using the Message Broker Toolkit. Ensure that the broker's SYSTEM.BROKER.ADMIN.QUEUE queue has been deleted and initiate a further topology deploy.
The broker should now have disappeared from the workbench.
Do not try to re-create a broker using the mqsicreatebroker command until you are confident that it has been removed from the workbench. Similarly, do not reuse broker or queue manager names until you are confident that they are not in use elsewhere.