In 1998 Süß said farewell to the big opera houses. Since then he has accepted various engagements at smaller stages. In 2003/2004, for example, he performed at the Anhaltisches Theater in Dessau as Ollendorf in Der Bettelstudent. He made further appearances in Eisenhüttenstadt, Putbus and other places in the new federal states of Germany "out of a desire for the cause".
Süß published a large number of records and CDs with opera arias and songs.
Since May 1990, he was a member of the Social Democratic Party of Germany. He became a member of the East Berlin Berliner Stadtverordnetenversammlung [de] in May 1990 and was a member of the Berlin-Mahlsdorf. Süß died, four days before his 85th birthday, in a nursing home in Friedland.[3]
Werner Breunig, Andreas Herbst (ed.): Biografisches Handbuch der Berliner Abgeordneten 1963–1995 und Stadtverordneten 1990/1991.[5] (Schriftenreihe des Landesarchivs Berlin. Vol. 19). Landesarchiv Berlin, Berlin 2016, ISBN978-3-9803303-5-0, p. 362 f.
Jan Wielgohs: Süß, Reiner. In Wer war wer in der DDR? 5th edition. Vol. 2. Ch. Links, Berlin 2010, ISBN978-3-86153-561-4.