  Evaluating Kaluza-Klein (KK) corrections is indispensable to test the
braneworld scenario. In this paper, we propose a novel symmetry approach to a
4-dimensional effective action with KK corrections for the Randall-Sundrum
two-brane system. The result can be used to assess the validity of the low
energy approximation. Also, our result provides the basis for predicting CMB
spectrum with KK corrections and the study of the transition from black strings
to black holes.
