The Germans led from start to finish to win in 1 minutes 42.213 seconds. Katalin Kovacs and Natasa Douchev-Janics of Hungary took the silver medal and Karolina Naja and Beata Mikolajczyk of Poland won the bronze.
Weber and Dietze were part of a German quartet whose 16-year dominance of the 500-meter K-4 ended Wednesday. They were beaten by a Hungary boat containing Kovacs.
But they bounced back to reclaim the title last won for Germany by two of their greatest Olympians—Birgit Fischer and Katrin Wagner-Augustin—in 2000.