  The contributions of the chiral gauge leptoquarks $V^{L,R}$ induced by the
chiral four color quark-lepton symmetry to the branching ratios of $ K_L^0,
B^0, B_s \to l_1 \, l_2 $ decays are calculated and analysed using the general
parametrizations of the fermion mixing matrices in the leptoguark currents.
From the current experimental data on these decays under assumption $ m_{V^L}
\ll m_{V^R} $ the lower mass limit $ m_{V^L} \cos{\gamma_L} > 5.68 \,\,
\mbox{TeV}$ is found, which in particular case of equal gauge coupling
constants gives $ m_{V^L} > 8.03 \,\, \mbox{TeV} $. The branching ratios of the
decays under consideration predicted by the chiral gauge leptoquarks are
calculated and analysed in dependence on the leptoquark masses and the mixing
parameters. It is shown that in consistency with the current experimental data
these branching ratios for $ B_s, B^0 \to \mu e $ decays can be close to their
experimental limits and those for $ B_s, B^0 \to \tau e, \tau \mu $ decays can
be of order of~$10^{-7}$. The calculated branching ratios will be useful in the
further experimental searches for these decays.
