To delete a brand, load the brand details page then click on. This will take you to a confirmation page. Click to confirm deletion, or click to return back to the brand details page.
Deleting a brand will not delete any clients that belong to the brand. Note however that those clients will no longer belong a brand, meaning users for that client will no longer be able to access the Control Panel. In this case you must edit the client and select a new branding for them.