Can the sewer pipe in the master bedroom be removed if it is not used by all owners?

Of course. Relevant information shows that the sewer pipe is owned by all owners and maintained by the property. If it is man-made damage, it should be compensated or repaired by the responsible person. If there is no relevant responsible person, then the property company should apply for housing maintenance fund for maintenance. It should be noted that the use of housing maintenance funds requires the consent of more than two-thirds of the owners of all communities.