We have a pair of 2 MX480 working in virtual chassis which we would like to break (into 2 independant MX480 nodes).
To delete a Virtual Chassis configuration for MX Series routers:
1.Delete the Virtual Chassis ports from each member router.
2.Delete the definitions and applications for the following configuration groups on each member router:
3.Delete the preprovisioned member information configured at the [edit virtual-chassis] hierarchy level on the primary router.
4.Delete any interfaces that were configured on the member routers when the Virtual Chassis was created.
5.Delete the Virtual Chassis member IDs to reboot each router and disable Virtual Chassis mode.
Please refer below documentation that provides example:
Example: Deleting a Virtual Chassis Configuration for MX Series 5G Universal Routing Platforms