Brightness temperature evolution with apparent core separation of robustly detected components in the 3C 345 jet at 43 GHz. Results from the 43 GHz observations from the multiwavelength dataset discussed in this paper are shown together with results obtained by Weaver et al. (2022) as well as model fits of the BEAM-ME project epochs from 2018 to 2023. The linear fits (black lines) approximate regions below and above a “break” marking the transition from the Compton- to the synchrotron-dominated losses at 0.16 mas from the VLBI core, the average position of S2 (Weaver et al. 2022). The fits yield T_b,  C = r^{−1.8 ± 0.5} and T_b,  S = r^{−4.1 ± 0.3}. We exclude unreasonably high brightness temperatures above 5 × 10¹² K.